Open Access

JSON Export

{"created":"2022-01-31T12:47:25.541080+00:00","id":"lit13724","links":{},"metadata":{"contributors":[{"name":"Anonymous","role":"author"}],"fulltext":[{"file":"p0001.txt","language":"en","ocr_en":"MARIETTA APPARATUS COMPANY Psychological Equipment MARIETTA. OHIO\nV1001 Standard Lamp VI002 Carbon Arc Lamp V1003 Neon Lamps V1004 Spectrum Tubes V1005 Spectrum Tubes\nV1101 Optical Disk\nV1201 Neutral Tint Filters V1202 Neutral Tint Wedges V1203 Monochromatic Filters V1204 Monochromatic Filters V1208 Red, Green & Blue Filters V1210 Colored Gelatine V1211 Mazda to Daylight Filter V1212 Stereo Red and Green Filters 71214 Set of Dichroic Filters V1215 \"Subjective Yellow\" Dye\nV1301 Color Dislcs-Paper V1302 Color Disks-Cardboard V1303 Color Disks-Celluloid V1305 Colored Yarns V130S Black Celluloid Sheets V1307 White Celluloid Sheets V1309 Magnesium Block V1310 Magnesium Ribbon V1311 Black Box V1315 Brightness Scale,\nV2001 Anatomical Model of Eye V2002 Charts of Eye V2005 Skioscopie Eye V2006 Kuehne Eye Model V2007 Blind Spot Cards V2009 Knapp\u2019s Ophthalmotrope V2010 Eye Movement Mirror V2011 Wink Reflex Apparatus V2012 Pbacoscope\nV2016 Chromatic Aberration Apparates\nV2017 Bezold Figure Card\nV2018 Irradiation Card\nV2019 Helmholtz Checker Board\nV2020 Isoscope\nV2021 Acuity Charts\nV2022 Astigmatic Charts\nV2023 Heterophoria Test\nV2024 Trial Frame\n72025 Trial Frame\nV2026 Lenses, Cylinders and Prisms\nV2027 Simple Retincscope\nV2028 Electric Retinoscope\nV2029 Doring Ophthalmoscope V2030 Electric Ophthalmoscope V2031 Ophthalomometer\nV3001 Spectroscope\nV3003 Spectroscope\nV3004 Spectroscope\nV3005 Replica Grating Spectroscope\nV3006 Absorption Band Plates\nV3010 Double Replica Crossed Gratings\nV3101 H.B, & S, Demonstrator\nV3201 Lambert\u2019s Color Mixing Box V3202 Conventional Color Shadow Board V3203 Binocular Color Mixing Cards for Sterescope\nV3204 Binocular Red and Green Mixer V3206 Maxwell Disk Rotator V3207 Maxwell Disk Rotator\n73208\tDifferential Rotator,\nMarietta Type\n73209\tDifferential Rotator, Diel\nV3301 Simultaneous Induetion 8ards V3303 Simultaneous Induction Disks V3304 \"Negative After-Image Cards V3306 Benham Disk V3307 Bering\u2019s Contrast Box \u00a53305 After Image Apparatus\nV3401 Threshold Disks V3402 Simple Masson Disk\n74001 Optical Bench V4002 Lummer-Brodhun Photometer Box \u00a54003 Bunsen Photometer V4004 Polarizing Photometer V4009 Sector Disk (Rotating Rhomboid Prisms)\nV4010 Foot Candle Meter\nV4011 Flicker Photometer\nV4013 Spectrometer\nV4014 Spectrometer\nV4015 Standard Spectrophotometer\nV4017 Photochromatic Interval\nApparatus\n75001 Peter\u2019s Hand Campimeter \u00a5T5002 Carr\u2019s Campimeter V5003 Schweigger Perimeter V5006 Perimeter Charts\n75007\tRegistering Perimeter\n75008\tMcliardy Perimeter\n75009\tMcliardy Electric Perimeter\n75010\tMarietta Perimeter\n76001\tMonochromatic Colorimeter\n76002\tDichromatic Colorimeter\n76003\tTrichromatic Colorimeter,\nAdditive","page":1},{"file":"p0002.txt","language":"en","ocr_en":"V6004 Trichromatic Colorimeter,\nSubtractive Type\nV6005 Standard Spectrophotometer V6006 Marietta Color Analyzer\nV7001 Donder\u2019s Test V7002 Scripture\u2019s Test V7003 The Williams Lantern V7004 The Thomson Lantern\nV7006 Jennings\u2019 Test V7007A Holmgren Test V7007B Holmgren Test V7007C Holmgren Test\nV7011 Stilling Test V7012 Ishihara Test\nV8001 Hering Falling Beads Apparatus V8002 Hillebrand Edge Apparatus\nV8101 Reflection Stereoscope\n(Wheatstone)\nV8102 Reflection Stereoscope\n(Bering\u2019s Ilaploscope)\nV8103 Demonstration Re*flection\nStereoscope\nV8104 Refraction Stereoscope, Brewster V8105 Refraction Stereoscope,\nRemovable Partition V810\u00d6 Refraction Stereoscope,\nAuxiliary Prisms V8107 Refraction Stereoscope,\nVariable Prisms V8108 Tube Stereoscope\n(Tropo stereoscope)\nV8109 Tube Stereoscope (Amblyscope)\nV8111 Filter Stereoscope\nV8112 Binocular Alternation Stereoscope\nV8113 Projection Stereoscope,\nPolarizing Type V8114 Projection Stereoscope,\nFilter Type V8115 Projection Stereoscope, Synchronized Type\n\u2022 \u2022\ta\nV8117 Mirror Pseudoscope V8118 Mirror Pseudo scope V8119 Total Reflection Pseudoscope ( Wheat stone-Dove)\nV8120 Lenticular Pseudo scope V8121 Stereoscopic Cards V8201 Illusion Cards V8202 Arrow Head Illusion Board V8302 Stereoscopic Motion Apparatus V8303 Antirheoscope V8305 Illusion of Motion Apparatus V8306 Illusion of Motion Apparatus V8307 IIl\\ision of Motion Apparatus V8308 Illusion of Motion Apparatus V8309 Illusion of Motion Apparatus V9001 Projection Tachistoscope V9002 Pendulum-Dick Tachistoscope V9003 Drop Tachisloscope V9004 Falling Balls Tachistoscope V9101 Exposure Apparatus V9102 Exposure Apparatus V9103 Reading -achistoscope\nV8203 Illusion Card V8204 Angle Illusion Card","page":2},{"file":"p0003.txt","language":"en","ocr_en":"A-1001\tModel of Ear\nA-2002\tWaggener Sound Y/ave Slide.\nA-2003\tWave Apparatus (Aiues and Bliss),\nA-2004\tCrova\u2019s Disk,\nA-2005\tTuning Fork.\nA-2006\tTuning Forks.\nA-2007\tTuning Fork,\nA-2008\tSet of Tuning Forks0\nA-2009\tSet of Tuning Forks,\nA-2010\tSet of Tuning Forks.\nA-2011\tTuning Fork Weights.\nA-2012\tDisk Siren.\nA-2013\tDisk Siren.\nA-2014\tDisk Siren.\nA-2015\tDisk Siren,\nA-2016\tAir Jet Attachment.\nA-2017\tOrgan Pipe.\nA-2018\tOrgan Pipe.\nA-2019\tOrgan Pipes,\nA-2020\tOrgan Pipes.\nA-2021\tOrgan Pipe,\nA-2022\tPitch Pipe.\nA-2023\tQuincke\u2019s Tube s,\nA-2024\tResonance Pubes.\nA-2025\tResonators.\nA-2026\tInterference Tubes.\nA-2027\tAcoustic Chart,\nA-2028\tSonometer.\nA-2029\tSonometer.\nA-3001\tGalton Whistle.\nA-3002\tGalton Whistle.\nA-3101\tSimple Acoumeter.\nA-3102\tDiscrimination Acoumeter.\nA-3201\tSound Hammer,\nA-3301\tAudiometer.\nA-3302\tAudiometer.\nA-3303\tAudiometer.\nA-3304\tAudiometer.\nA-4001\tSound Cage.\nA-4002\tSound Cage.\nA-4003\tTonal Apparatus for Phase Control\nC-1001\tOlfactometer.\nC-1002\tOlfactometero\nC-1003\tSmell Solutions.\nS-1001\tRubber Stamp.\nS-1101\tAlgesiometer,\nS-1201\tTemperature Cylinders.\nS-1202\tHeat Grill,\nS-1301\tElectromagnetic Aesthesiometer.\nS-1302\tVon Frey\u2019s Threshold Scale.\nS-1303\tHair Aesthesiometer0\nS-1304\tTyro Point Aesthesiometer.\nS-1305\tSpearman\u2019s Aesthesiometer.\nS-1306\tTactual Perception Board.\nS-1401\tElbow Movement Board,\nS-1402\tDiscrimination Weights\nS-1411\tSize Weight Illusion.\nS-1403\tTemporal Finger Maze.\nP-1001\tInstructions Box.\nP-2001\tComplication Pendulum.\nP-2002\tComplication Clock,\nF-3001\tMirror Drawing Apparatus.\nP-3011\tFreeman\u2019s Puzzle Box.\nP-3002 Goddard\u2019s Form Board*\nP-3003 \u2018Test r.f Mechanical'Intelligence P-3004 Packing Blocks Test*\nP-4001 Vernier Chromoscope.\nP-3007 Puzzle Board*\nP-4002 Modified Sanford Chronoscope* P-4003 Marietta Reaction Time Set, P-3005 Mirror Drawing Apparatus.\nP-3105 Pintner-Paterson Performance\nTest,\nP-3106 Test of Mechanical Ability. P-3107 Puzzle Board.\nP-3208 Multiple Choice Apparatus. P-3209 Multiple Choice Apparatus, P-3010 Minnesota Test of Mechanical\nAbility,\nP-4004 Marietta Chronoscope.\nP-4005 The New Marietta Chronoscope, P-4006 Interval Apparatus.\nP-3011 Automatograph,\nP-3012 Steadiness Test.\nP-3013 Tapping Test,\nP-3014 Precision Board.\nP-3015 Steadiness Test.\nP-3016 Tremograph,\nP-3017 Galton Bar.\nP-3018 Vertical Test.\nP-3019 Angle Test,\nP-3020 Two-hand Coordination Pursuit\nMeter,\nP-3101 Legs Steadiness Test,\nP-3102 Back and Legs Ergograph.\nP-3021 Two Hand Coordination Test, P-3022 Vertical Radius Test.\nP-2023 Horizontal Bisecting Test. P-4007 Roemer Sound Key.\nP-4008 Catell Sound Key,\nP-4009 Five Finger Key.\nP-4010 Mttller-Pilzeeker Lip Key,\nP-4011 Telegraph Sounder.\nP-4012 Telegraph Key,\nP-5001 Attention Apparatus,\nP-5002 Epicycloid Pursuitmeter,\nP-5003 Drip Timing Device,\nP-6001 Psycholgalvanic Response\nApparatus,\nP-6002 Knee Jerk Apparatus,\nP-6003 Wink Reflex Apparatus.\nP-6004 Plethysmograph.\nP-6005 Pneumograph (Berth).\nP-6006 Cardiograph (Jacquet),\nP-6007 Sphygomograph (Lehmann).\nP-6008 Sphygomograph.\nP-6009 Pneumograph (Marey),\nP-6010 Pneumograph (Gutzmann),\nP-6011 Pneumograph.\nP-6012 Electric Pneumograph (Cason). P-7001 Wet Spirometer,\nP\u20147002 Hand Dynanometer,\nP-7003 B?ck & Leg Dynanometer,\nP\u20147005 Dry Spirometer,\nP-7006 Wet Spirometera P-7007 Stroke Testa","page":3},{"file":"p0004.txt","language":"en","ocr_en":"P-7004\nP-8001\nP-8002\nP-8003\nQ-1001\nP-8004\nP-8005\nP-8006\nQ-1101\nQ-2001\n0-2002\nQ-2003\nQ-2101\nQ-2102\nQ-2103\n0-2104\nQ-2105\nQ-2106\n0,-2107\nQ-2108\n0-3002\nQ-3003\n0-3004\nQ-3005\nQ-3102\n0-4001\nQ-4002\nQ-4003\nQ-4101\nQ-4012\nQ-5001\nQ-5101\nQ-5111\n0-5122\nQ-6110\n0-6111\n0-6113\n0-6201\n0-6202\nQ-6203\n0-6204\n0-6205\n0-6206\n0-6207\nQ-6208\n0-9001\nPneumo-clynamome te r \u2022\nAnthropometric Scale\u00ab\nAnthropometer Scale.\nStadiometer,\nKymo graphs.\nFacial Goniometer\u00ab\nCraniometer.\nCraneal Calipers.\nKynograph Smoker\u00ab\nMetronome.\nMetronome, Electric Contacts.\nStop Clock\u00ab\nElectrically Maintained Tuning Fork.\n50 P.V.\nElectrically Maintained Tuning Fork\n100 D.V\u00ab\nStop Watch\u00ab\nPaster Stop Watch.\nStop Watch,\nStop Watch\u00ab\nl/lOO Second Stop Watch. l/50 and l/lOO of a Second Stop Tunable Marker,\tWaten\u00ab\nElectromagnetic Marker\u00ab\nTriple Electromagnetic Marker, Seconds Marker,\nJointed Tambour Marker.\nThree Unit Electro-Magnetic Counter, Electric Counter,\nElectric Counter.\nCounters,\nStop \u2018Watch Tachometere Electric Motor.\nAmmeters and Voltmeters\u00ab\nShort Circuiting Key,\nKnife Switches^\nGalvanometer,\nResistance Box,\nWheatstone Bridge Rheostat, Rheostats.\nCommutatorsc Telegraph Key,\nTelegraph Sounder, photoelectric Cell,\nTransformers9 Step Dovm\u00bb Transformers, Step Up,\nMercury Sxvitch,\nTripod Bases.","page":4},{"file":"p0005.txt","language":"en","ocr_en":"MARIETTA APPARATUS COMPANY Psychological Equipment MARIETTA, OHIO\n\u00a5-3006 Absorption Band Plates A-3102 Acoumeter, Discrimination A-3101 Acoumeter, Simple A-2027' Acoustic Chart \u00a5-2021 Acuity Charts A-2016 Air Jet Attachment V-2022 Astigmatic Charts \u00a5-3305 After Image Apparatus 3-1304 Aesthesiometer, Tito point S-1301 Aesthesiometer, Electromagnetic\nS-1303 Aesthesiometer, Hair S-1305 Aesthesiometer, Spearman' s\nS-1101 Algesiometer Q-5101 Ammeters and voltmeters P-8001 Anthropom\u00e9trie Scale P-8002 Anthropometric Scale V-8303 Antirheoscope P-5001 Attention Apparatus A-3301 Audiometer A-3302\t!i\nA-3303\t\"\nA-3304\t\"\nP-3011 Automatograph\n\u00a5-3306 Bonham Disk V-2017 Bezold Figure Card \u00a5-1311 Black Box \u00a5-2007 Blind Spot Cards 7-1315 Brightness Scale\n\u00a5-5002 Campimeter, Carr's V-5001 Campiineter, Peter's Hand P-6006 Cardiograph, (Jacquet) \u00a5-1306 Celluloid Sheets, Black \u00a5-1307 Celluloid Sheets, White \u00a5-2019 Checker Board, Helmholtz \u00a5=\u00bb2016 Chromatic Aberration Apparatus\nP-4004 Chronoscope, Marietta P-4005 Chronoscope, The New Marietta\nP-4002 Chronoscope, Modified Sanford\nP-4001 Chronoscope, \u00a5ernier \u00a5-6006 Color Analyzer,\nMarietta\n\u00a5-6002 Colorimeter, Dichromatic \u00a5-6001 Colorimeter, Monochromatic \u00a5-6003 Colorimeter, Trichromatic. Additive Type\n\u00a5-6004 Colorimeter, Trichromatic, Subtractive Type\n\u00a5-1302 Color Disks, Cardboard \u00a5-1303 Color Disks, Celluloid \u00a5-1301 Color Disks, Paper \u00a5-3204 Color Mixer, Binocular Red and Green\n\u00a5-3201 Color Mixing Box, Lambert's \u00a5-3203 Color Mixing Cards for Stereoscope, Binocular \u00a5-3202 Color Shadow Box, Conventional\n\u00a5-1305 Colored Yarns Q--6202 Commutators P-2002 Complication Clock P-2001 Complication Pendulum \u00a5-3307 Contrast Box, Bering's P-8006 Cranial Calipers P-8005 Craniometer Q-4I01 Counters Q-4002 Counter, Electric Q-4003\t\"\t\"\nQ-4001 Counter, Three Unit Ele ctromagnetic A-2004 Crova's Disk\nS-1402 Discrimination Weights \u00a5-1215 Dye, \"Subjective Yellow\" P-7003 Dynamometer, Back and Leg P-7002 Dynamometer, Hand\nA-1001 Ear, Model of\n\u00a5-8002 Edge Apparatus, Hillebrand\nS-1401 Elbow Movement Board\nQ-5001 Electric Motor\nP-3102 Ergograph, Back and Leg\n\u00a5-9101 Exposure Apparatus\n\u00a5-9102\t\"\t\"\n\u00a5-2001 Eye, Anatomical Model of \u00a5=\u25a0=2002 Eye, Charts of \u00a5-2006 Eye, Kuehne Model \u00a5\u20142010 Eye Movement Mirror \u00a5-2005 Eye, Skioscopic\n\u00a5-8001 Falling Beads Apparatus, Hering\n\u00a5-1211 Filters, Mazda to Daylight \u00a5-1203 Filters, Monochromatic \u00a5-1204\t\"\t\"\n\u00a5-1201 Filters, Neutral Tint \u00a5-1214 Filters, Set of Dichroic \u00a5-1208 Filters, Red, Green & Blue \u00a5-1212 Filters, Stereo Red & Green P-3002 Form Board, Goddard's\nP-3017 Galton Bar","page":5},{"file":"p0006.txt","language":"en","ocr_en":"2\nA-3001 Gal ton T/\u00efhistle A-3002\t\"\t\"\nQ-6110 Galvanometer V-1210 Gelatine, Colored P-8004 Goniometer, Facial V-3010 Gratings, Double Replica Crossed\nS-1202 Heat Grill\nV-3101 H. B. & S. Demonstratoro\nV-8202 Illusion Board, Arrow Head V-8201 Illusion Cards.\nV-8203\t\"\t\"\nV-8204 Illusion Card, Angle V-8305 Illusion of Motion Apparatus Y-8306\t\"\t\"\t\"\nV-8307\t\"\t\"\t\"\nY-8308\t\"\t\"\t:I\nV-8309\t\"\t\"\t\"\nS-1411 Illusion, Size l\u00efeight P-1001 Instructions Box\nA-2026 Interference Tubes P-4006 Interval Apparatus Y-2018 Irradiation Card. V-2020 Isoscope\nP-4009 Key, Five Finger P-4010 Key, M\u00fcller-pilzecker Lip P-4008 Key, Catell Soundc P-4007 Key, Roemer Sound Q-5111 Key, Short Circuiting P-4012 Key, Telegraph Q-6203\t\u201c\t\"\nP\u20146002 Knee Jerk Apparatus Q-1001 Kymographs Q-1101 Kymograph Smoker\nV-1002 Lamp, Carbon Arc V-1003 Lamp, Neon V-1001 Lamp, Standard V-7004 Lantern, The Thomson Y-7003 Lantern, The Williams V-2026 Lenses, Cylinders and Prisms\nQ-3003 Marker, Electromagnetic Q^'3102 Marker, Jointed Tambour Q-3DO5 Marker, Seconds Q-3004 Marker, Triple Electromagnetic\nQ-3002 Marker, Tunable V-1309 Magnesium Block V-1310 Magnesium Ribbon Y**3402 Masson Disk, Simple S-1403 Maze, Temporal Finger V-4010 Meter, Foot Candle 0,-2001 Metronome\nQ-2002 Metronome, Electric Contacts P-3208 Multiple Choice Apparatus\nP-3209 Multiple Choice Apparatus P-3001 Mirror Drawing Apparatus P-3005\t\"\t\u201d\t\"\nV-3304 Negative After Image Cards\nC1001 Olfactometer C-1002\t\"\nV-4001 Optical Bench V-1101 Optical Disk A-2017\tOrgan\tPipes\nA-2018\t*\t*\nA-2019\t\"\nA-2020\t\"\t\"\nA-2021\tM\t\"\nV-2031 Opthalmometer V-2030 Opthalmoscope, Electric V-2029 Opthalmoscope, Loring V-2009 Opthalmotrope, Knapp\u2019s\nV\u20145010 Perimeter, Marietta V-5008 Perimeter, McHardy V-5009 Perimeter, McHardy Electric\nV\u20145007 Ferimeter, Registering V-5003 Perimeter, Schweigger V-5006 Perimeter Charts V-2012 Phacoscope V-4017 Photoshromatio Interval Apparatus\nQ-6205 Photoelectric Cell V-4002 Photometer Bax Lummer-Brodhun V-4003 Photometer, Bunsen V-4011 Photometer, Flicker V-4004 Photometer, Polarizing A-2022 Pitoh Pipe P-6004 Plethysmograph P-7004 rneumo-dynamometer P-6011 Pneumograph P-6005 Pneumograph (Berth) P-6012 Pneumograph, Electric (Cason)\nP-6010 Pneumograph (Gutzmann) P-6009 Pneumograph (Marey) P-3014 Precision Board V-8120 Pseudoscope, Lenticular V-8117 Pseudoscope, Mirror V-8113\tw\tM\nV\u20148119 Pseudoscope, Total\nReflection, (iVheatstone-Dove)\nP-5001 Psychogalvanic Response Apparatus\nF-5002 Pursuitmeter, Epicycloid P-3020 Pursuitmeter, Two-hand Coordination P-3007 Puzzle Board T-3107\t\"\t\"","page":6},{"file":"p0007.txt","language":"en","ocr_en":"3\nP-3011 Puzzle Box, Freeman\u2019s A-2023 Quincke\u2019s Tubes\nP-4003 Reaction Time Set,\nMarietta\nQ-6111 Resistance Box A-2024 Resonance Tubes A-2025 Resonators V-2028 Retinoscope, Electric V-2027 Retinoscope, Simple Q-6201 Rheostats\nQ-6113 Rheostat, Wheatstone Bridge V-3209 Rotator, Differential, Diel V-3208 Rotator, Differential, Marietta Type\nV-3206 Rotator, Maxwell Disk V-3207\t\"\t\"\t\u201d\nS-1001 Rubber Stamp\nV-4009 Sector Disk, (Rotating Rhomboid Prisms)\nV-3301 Simultaneous Induction Cards\nV-3303 Simultaneous Induction\nCards\nA-2012 Siren, A-2013\t\"\nA-2014\t\"\nA-2015\nDisk\nit\nI!\nIf\nC-10C3 Smell Solutions\nA-2023 Sonometer A-2029\t\"\nA-4001 Sound Cage A-4002\t\"\t\"\np-4011 Sounder, Telegraph Q-6204\t. \"\t\"\nA-3201 Sound Hammer\nA-2002 Sound Wove Slide, Waggener\nV-4013 Spectrometer\nV-4014\t\"\nV-4015 Spectrophotmeter, Standard T-6005\t\"\t\"\nV-3005 Spectroscope, Replica Grating\nV-3001 Spectroscope V-3003\t\"\nV-3004\t\"\nV-1004 Spectrum Tubes V-1005\t\"\t\"\nP-7005 Spirometer, Dry P-7001 Spirometer, Wet P-7006\t\"\t\"\nP-6008 Sphygmograph P-6007 Sphygmograph (Lehman) P-8003 Stadiometer V-8112 Stereoscope, Binocular Alternation\nV-8104 Stereoscope, Brev/ster Refraction\nV-8103 Stereoscope, Demonstration Reflection\nV-8111 Stereoscope, Filter V-8114 Stereoscope, Projection Filter Type\nV-8113 Stereoscope, Projection Polarizing Type\nV-8115 Stereoscope, Projection Synchronized Type V-8102 Stereoscope, Reflection (Bering\u2019s Haploscope)\nV-8101 Stereoscope, Reflection (Wheatstone)\nV-8105 Stereoscope, Refraction Removable Partition V-8106 Stereoscope, Refraction Auxiliary Prisms V-8107 Stereoscope, Refraction, Variable Prisms V-8109 Stereoscope, Tube,\n( Amb lys cope)\nV-8108 Stereoscope, Tube (Tropostereoscope)\nV-8121 Stereoscopic Cards V-8302 Stereoscopic Motion Apparatus Q-2003 Stop Clock Q-2103 Stop Watch Q-2105\t\"\t\"\nQ-2106\t\"\t\"\nQ-2108 Stop Watch, l/50, and l/lOO second\nQ-2'107 Stop Watch, l/lOO second\nQ-2104 Stop Watch, Pastor Q-5122 Switches, Knife Q-6208 Switch, Mercury\nV-G003 Tachistoscope, Drop V-9004 Tachistoscope, Falling Balls V-9002 Tachistoscope, Pendulum Disk\nV-9001 Tachistoscope, Projection V-9103 Tachistoscope, Reading Q-4012 Tachometer, Stop Watch S-1306 Tactual Perception Board S-1201 Temp rature Cylinders P-3019 Test. Angle V-V001 Test, Bonder's V-70I2 Test, Ishihara V-7006 Test, Jenning's V-2023 Test, Heterophoria V-7007A Test, Holmgren V-7007B\t\"\t\"\nV-7007C\t\"\t\"\nP-2023 Test, Horizontal Bisecting P-3101 Test, Legs Steadiness P-3106 Test of Mechanical Ability P-3010 Test of Mechanical Ability Minnesota","page":7},{"file":"p0008.txt","language":"en","ocr_en":"4\nP-3003\nP-3004\nP-3105\nV-7002\nP-3012\nP-3015\nV-7011\nP-7007\nP-3013\nP-3021\nP-3018\nP-3022\nV-3401\nS-1302\nP-5003\nQ-6206\nQ-6207\nP-3016\nV-2024\nV-2025\nQ-9001\nA-4003\nA^-2005 A-2006 A-2007 A-2008 A\u20142009 A-2010 0-2101\nQ-2102\nA-2011\nTest of Mechanical Intelli*\u00bb gence\nTest, Packing Blocks Test, Pintner-Paterson Performance Test, Scripture\u2019s Test, Steadiness\nit\tii\nTest, Stilling Test, Stroke Test, Tapping\nTest, Two-hand Coordination Test, Vertical Test, Vertical Radius Threshold Bisks Threshold Scale, Von Frey\u2019s. Timing Device, Drip Transformers, Step Dovm Transformers, Step IFp Tremqg raph\nTrial Frame\nh h\nTripod Bases\nTonal Apparatus for\nPhase Control\nTuning Forks h\th\nit\tit\nTuning Forks, Set of ii\th\th\tii\nh \u00bb \u00ab h\nTuning Fork, 50 DV. Electrically Maintained Tuning Fork, 100 DV. Electrically Maintained Timing Fork Weights\nQ-5101 Voltmeters and Ammeters\nA-2003\nV-1202\nP-6003\nV-2011\nWave Apparatus (Ames and Bliss)\nWedges, Neutral Tint\nWink Reflex Apparatus \u00ab h h","page":8},{"file":"p0009.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig. 1\nFig. 2\nFig. 3\nFig. 4\nFig. 5\nFig. 6","page":9},{"file":"p0010.txt","language":"en","ocr_en":"VI001\nVI002\nV1003\nVI004\nV1005\nV1101 Fig.16\nVI2 01\nV1202\nV1203\nVI204\nStandard Lamp. Tungsten filament. Supplied in either 25 or 50 viratts; accompanied by certificate of candle power and voltage. Accompanied also by table of typical tungsten lamp spectral energy distributions, with comparison of daylight distribution values -\t-\t$ 15.00\nCarbon Arc.Lamp. Carbons at right angles, mounted in sheet iron case, with condensing lens which provides converging, parallel, or diverging beam. Mounted on tripod stand with swivel clamp. Provides an oppuox-imate point source of considerably intensity. Has rheostat, connecting cord, and six pairs of carbons. -\t-\t$ 25.00\nNeon Lamps for 110 volts, A.C, These are small lamps with standard Edison base, suitable for stroboscopic uses, on 60 cycle current.\n$ 1.00\nSpectrum Tubes, Any size or shape, any gas, including mercury vapor, in amber glass providing green lines only. Complete with transformer of suitable voltage. Tubing per foot, $2.00, minimum $5.00 per tube. Transformers, any size, $1,00 per thousand volts, minimum size -\t$\t3.00\nSpectrum Tubes. Standard types. - each\t~\t-\t$\t3,00\nOotical Disk,\nThis instrument consists of a metal dial 30 cm. in diameter, silver satin finish with etched graduations. Supports for use in vertical or horizontal position. The outfit includes one each of the following: Spherical lens, hemispherical lens, double convex lens, double concave lens, 90\u00b0 triangular prism, 45\u00b0 and 90\u00b0 trapezoidal prism, plane mirror, concave mirror, convex mirror and three colored glass screens, Price -\t-\t-\t-\t$26.50\nDiverging ray attachment for above\t-\t-\t$10.00\nSource of light for parallel rays\t~\t-\t$16.00.\nNeutral Tint Filters. Made of gelatine containing a mixture of dyes so balanced as to produce practical spectral neutrality. Transmission range: 75/a, 50^, 25%, 10/\u00a3, 5%, 1%, ,1/a,\u00bb01%, Cemented in good quality glass, in 2 inch squares, each -\t-\t-\t$ 5.00.\nNeutral Tint Wedges, Similar in character to V1201, with wedge ranges as follows:\nA\u2014100 to 50^o, B\u2014100 to 10%, 8\u2014100 to 1%,\nD\u2014100 to clfoj E--100 to ,01^0\u00bb Made in three sizes (tinted area)\n10 x Lg- cm, 15 x 2 cm, 20 x 3 cm.\nPlain wedge: small size - $8.50; medium - $11.50; large - $ 14,50 Provided with balancing wedge - $11.50; 16.00\tf> 19.50\nCalibrated, with \"\t\"\t$14.50; 19.50\t$ 22.50\nMonochromatic Filters. Set of seven with narrow transmission bands. Cemented in glass plates, 2 inches square \u2014\t$ 35.00.\nMonochromatic Filters, Glass. Approximate transmissions:\t\tSpecii\nFilter A\t690\tZl%\nB\t623\t8%\nC\t578\t2;%\nD\t546\t14$\nE\t491\t5$\nF\t435\t22%\nG\t404\t4$\nH\t365\t31$\nIn 2\u201d squares\t: polished, each unpolished, \"\ts/5.00 $2.50\n(Other siz<\tes, and other transmiss;\t\n. set for use with mercury light.\nPercent Transmitted\nh h\n(also some 690 )\n-\tper set\t$ 35.00.\n-\tper set\t$ 17.50.\nons, prices on request.)","page":10},{"file":"p0011.txt","language":"en","ocr_en":"V1208\nV1210\nV1211 VI212 VI214\nV1215\nV1301\nV1302\nVI3 03\nVI3 05 VI30 6\nV1307\nV1309\nVISIO\nV1311\nBed, green, and blue filters. Cemented in good white glass, 2\" square, Per set\t-\t-\t-\nColored Gelatine\u00bb Sheets 10 inches square, set of 20, without specified transmissions. Set of small samples sent free on request\t-\t-\t-\nSpecial Filter, mazda to daylight, 2\" square, -\nSpecial Filters, \"stereo\" red and blue-green, 2\" square\n11.00.\n$\t5.00.\n$\t3.25\n$\t5.25\nSet of Dichroic Filters. Useful in demonstrating the shift in \"dominant wave length\" or hue value due to variations in thickness of absorbing medium.\t-\t-\t$ 10,00.\n\"Subjective Yellow\" Dye. This provides a striking illustration of a \"yellow\" substance which is free from \"yellow\" spectral transmission, having transmission only in the red and the green region. $ 5.00.\nColor Disks- Paper. Diameter: large 7-f-\", small 5^\"\u2022 Hole -g\" diameter.\nSet A: (44 disks) consists of one large and one small of each of the following (22) colors: red, red orange, orange red, orange, yellow orange, orange yellow, yellow, green yellow, yellow green, green, blue green, green blue, blue, purple blue, blue purple, purple, red purple, purple red, black, white, two grays.\t-\t-\t-\t-I\nSet B; (16 disks) consists of one large and one small of each of the following (8) colors: red, orange, yellow, green, blue, purple, black and white.\nSingle colors, any size, per dozen -\nI\ndS\nV\n2.25\n1.25\n1.00\nColor Disks - Cardboard. Set of 40 disks, consisting of one large and one small of each of the same colors as in II-1-34 Set A, except grays.\nSingle colors: any size, per dozen\nColor Disks- Celluloid. Set of 12 disks, consisting of one large and one small of each of the following: red, yellow, green, blue, black and white. -\t-\nSingle Colors, any size, per dozen\t-\t-\nColored Yarns, set of 90 skeins of wool.\t-\nBlack Celluloid Sheets (opaque) jflO thickness, 10x12 in.\n12x20 in. 20x25 in. 20x50 in.\nWhite Celluloid Sheets (opaque) -ylO thickness\n$ 4.50\n\u00a7 2.00\n\u00a7 3.50 $ 3.75\n\u00a715.00\nip .50 .75\n1.25\n2.25\n(Same prices as V1306)\nMagnesium Carbonate Block Magnesium Ribbon\nBlack Box, Velvet Lined, 10\"xl0\"x4', with changeable slit front\t-\n\u00a7\n.25\n1.00\n15.00","page":11},{"file":"p0012.txt","language":"en","ocr_en":"\nTHE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig. 9\nFig. 14\nFig. 15","page":12},{"file":"p0013.txt","language":"en","ocr_en":"V1315 Brightness Scale, Thirty shades on celluloid shoots 15 cm, square. For sot\nA\n\u00ab\nV2001 Fig.3,\nV2002\nAnatomical Model of\nCharts of Eye, A B C D E\nEye.\n(Figure l) (Figure 2) (Figure 4) (Figure 5) (Figure 6)\n$\ns?\n$\n$\nV2005 Skioscopic Eye, with simple retinoscope, and set of\nFig. 21 instructions\t-\t-\t$\nV2006 Kuehne Eye Model. With this instrument the optical construction of the eye, its normal and abnormal condition and the necessary corrections can be demonstrated and studied. The model consists of a tank with glass sides and back, and a cornea at the front, with extra parts as follows: one cylindrical lens for showing astigmatism, two lenses representing the accommodation for near and far objects, six spherical and six cylindrical correcting lenses, set of diaphragms for demonstrating spherical aberration, etc. Complete with fluorescent dye for making the path of the rays visible, and full instructions,\t-\t-\t\u00a7\nV2007 Blind Spot Cards.\t-\t-\t-\nV2009 Knapp\u2019s Ophthalmotrope. A simple device for demonstrating Fig.35-1 the action of the external muscles of the eyes. The eyes are mounted on ball-and-socket pivots, and the various muscles are represented by cords running over pulleys to weights,\t-\t-\t-4\nEye Movement Mirror (Freeman)\t-\t-\t4\nWink Reflex Apparatus\t-\t$\nPhacoscopo (Sanson's Images Apparatus -\t4\nV2010 Fig. 36 V2011\nV2012\nV2016 Chromatic aberration apparatus. This equipment consists of two parts. The first is a special type of filter which transmits only the wave lengths at the extreme ends of the spectrum. When viewed through this filter the filament of a Mazda lamp appears to have a violet core surrounded by a red margin. The second part consists of a box containing, side by side, on holders which are adjustable forward and backward, two vertical stenopaic slit disks. These are illuminated from behind by two lamps, the light of which shines through blue and red glasses respectively. These red and blue slits are viewed through a horizontal slit.\nThe effect of chromatic aberration on accommodation is demonstrated by the distance adjustment necessary to produce apparent equality. -\t-\tsi>\nV2017 Bezold Figure Card. This card contains a large and a small Fig. 35-8 figure, each consisting of a series of concentric black and white circles. \u2018When out of focus, the circles show colored margins, due to chromatic aberration\t-\t'4\n7.50.\n25.00\n5.00\n4.00\n5.00\n3.00 3.00\n15.00\n65.00.\n4.50.\n45.00.\n12.00.\n15.00.\n75.00.\n32.00.\n1.00","page":13},{"file":"p0014.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig. 16\nFig. 17\nFig. 22\nFig. 24\nFig. 20","page":14},{"file":"p0015.txt","language":"en","ocr_en":"V2018. Irradiation Card# This card shows a white square containing a smaller black square, and a black square containing a smaller white square. The paired squares are the same size, and appear to be approximately equal in area in low illumination, but under a strong light tho contained squares appear quite different in size\t-\t-\t-\t-\t$\t1,00\nV2019 Helmholtz Checker Board, This figure, though containing ...\nFig. 35-7 no straight lines, appears as a perfect checker board when\nheld close to the eye#\t-\t-\t-\t$ 2.00\nV2020 Isoscopo (Bonders)# An apparatus for studying the conditions for\nFig#35-2 \"Subjective Vertical.\" If two strings are presented to the left eye and one vertical one to the right eye, and if a person looks at them in such a way that in the binocular image the right string lies between those of the left eye, then the strings, which are in reality parallel, seom in general to be inclined one toward the other. Conversely, the strings of the one eye must be inclined at a definite angle toward the string of the other eye, if all three appear to be parallel. The ptirpose of the isoscope is to determine the relation of the subjective binocular vertical to the objective vortical and its dependence on convergence, on the inclination of the plane of vision, and on contours which are also in tho field of vision,\n\tetc.\t-\t-\t-\t^ | <\t!?\t35.00.\nV2021 Fig. 18 Fig. 19\tAcuity Charts\t-\t-\t9 1.00 .\nV2022 Fig. 8 Fig. 14 Fig. 15\tAstigmatic Charts. Rotary Type\t-\t-\t9\t1.00. \u00a7\t2.00.\nV2023\tHeterophoria Test. This consists of a simple trial with red and green disks, and 3 paris of prisms, \u00ffD,\tframe ID & 2D.\t$ 12.00.\nV2024\tTrial Frame. Simple open type, with celluloid scale\t\u2022\t9\t5.00.\nV2025 Fig. 9\tTrial Frame# Revolving cell, adjustable temple and parts.\t-\t-\t-\tnose\t9\t15,00.\nV2026\tLenses, Cylinders, and Prisms for use in trial frames V2023, V2024,\"and V2025, Lenses plus or minus, up to 8,00 D per pair Cylinders plue or minue, up to 8,00 D per pair\t- Prisms, up to 8 D per pair\t\t9\t2.50. $\t3.50. $\t3.00.\nV2027\tSimple Retinoscope, non-luminous\t-\t9\t3.50.\nV2028\tElectric Retinoscope\t-\t-\t$ 26.00.\nV2029\tLoring Ophthalmoscope, non-luminous -\t-\t$ 16.00.\nV2030 Fig. 17\tElectric Ophthalmoscope\t-\t-\t9 25.50.\nV2031\tOphthalmometer\t_\t9195.00\u00bb","page":15},{"file":"p0016.txt","language":"en","ocr_en":"MARIETTA APPARATUS COMPANY, MARIETTA, OHIO\nPSYCHOLOGICAL EQUIPMENT\nFIG. 35-4\n\u00ae \u2014\nFIG. 35-2\nFIG. 35-3\nFIG. 35-6","page":16},{"file":"p0017.txt","language":"en","ocr_en":"MARIETTA APPARATUS COMPANY, MARIETTA, OHIO\nPSYCHOLOGICAL EQUIPMENT\nFIG. 35-10\nFIG. 35-11\nFIG. 35-9\nFIG. 35-12","page":17},{"file":"p0018.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig. 26\nFig. 29","page":18},{"file":"p0019.txt","language":"en","ocr_en":"V3001 Spectroscope, Pocket Size, Threo and one-half inches long $\t22,50.\nFig. 23\nV3003 Spectroscope. A compact spectroscope of standard typo. It Fig.20 rives a brilliant spectrum of ample length and sharpness. The collimator and the tolescope objectives are of 15 mm. aperture and about 125 mm, focal length. The telescope has focal adjustment and rotation to permit setting on any part of the spectrum. The scale is mounted on a draw tube to permit adjustment to the focus of the telescope.\t-\t0\t55.00.\nV3004 Spectroscope. This spectroscope is 260 mm. high; the collimator\nand the telescope objectives are 25 mm. aperature and about 200 mm. focal length. The slit is of adjustable width and 10 mm. in length. The telescope rotates about the axis of the instrument by means of a tangent screw over a sufficient angle to permit ready observation of the entire spectrum. The scale is mounted at the proper angle to secure full reflection from the face of the prism and is so adjusted as to bring the scale image to the proper position.\t-\t-\t$ 90.00.\nComparison Prism, fitted to slit\t-\t\u00a7 8.50.\nDelicate Focusing adjustment for Telescope\t-\t8 9.00.\nElectric Lamp for Scale\t-\t-\t\u25a0#\t8.00,\nV3005 Replica Grating Spectroscope. This apparatus consists of a light-tight box, with eye piece, adjustable slit and replica grating, wave length scale 18 cm. long, and holder for spectrum tubes, etc. Useful as a simple demonstration typo of\nspectrometer and means of spectroscopic analysis.\t-\t\u00a7 50.00.\nV3006 Set of 10 absorption band gelatine sheets suitable for use with Y3005\n$\t7.50.\nV3010 Double Replica Crossed Gratings for Lantern Projection\t$ 25.00.\nV3101 H.B. & S. Demonstrator. A special type of differential rotator, carrying a black sector disk superimposed upon a special 3-zone color disko The inner zone illustrates changes in hue, the middle gone, changes in brilliance, the outer zone, changes in saturation.\nThe colored disk is 50w> exposed and \"slips\" on the sector disk at the rate of one revolution in 450\t. This differential\nchange is automatic, and has the optimum rate for observation of changes. There are 6 color disks in the set, illustrating the following hue combinations: R-Y, Y-G, G-B, B-R, and two pairs of complementarieso\nWithout motor\t-\t-\t$ 55*00.\nWith motor\t-\t-\t0 72.00*\nV3201 Lambert's Color Mixing Box. This device consists of a light,\ntight box, with eye piece, a pair of transparent colored plates, a movable light source, and a partition of plate glass. The arrangement provides for fusion of the one color transmitted and the other reflected by the olate glass. The relative intensity of the two components is controlled by the position of the light, y 58*00\nV3202 Conventional Color Shadow Board -\t-\t0 54.00\nFig.35-S\nv\nV3203 Binocular Color Mixing Cards for Stereoscope. Set of 10\n5.00","page":19},{"file":"p0020.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig. 31\nFig. 33","page":20},{"file":"p0021.txt","language":"en","ocr_en":"\u00a53204 Binocular Red and Green Mixer, This device provides an Fig.55-11 effective means of demonstrating the binocular synthesis of yellow from red and green,\t-\t\t\t\tV\t35.00,\n\u00a53206 Fig.41\tMaxwell Bisk Rotator\t-\t\t-\t$\t22.00,\nV3207 Fig. 15:\tMaxwell Bisk P.otator\t- 2\t\t-\t<*S\t29.00\nV3208\tDifferential Rotator, Marietta\tTypo - with motor\t\t\u00a7\t83.00\n\u00a53209\tDifferential Rotator (Biel)\t\t-\t\u00f6\t115.00\n\u00a53301\tSimultaneous Induction Cards.\tThese\tcards have a star\t\t\nshaped hole in the centre, through which a gray surface is viewed. By holding the card at an appropriate angle, and at a suitable distance above the gray surface, so that the light illuminating both surfaces provides an approximate equality of brightness, v- induction effect is secured, .\t... .b.\nSot of 12, three each of four colors\t0\t2,50.\n\u00a53303 Simultaneous Induction Bisks, Pairs of largo and small paper disks, with intermediate disks of black and white. The gray zone shows induction effect and illustrates dependence of same on ratio of brightness of gray to that of the inducing color.\nSet of 6 colors\t-\t-\tv 2.00.\n\u00a53304 Negative After-Image Cards,\nSet of 12, three each of four colors\t-\t0\t3,50,\nV3305 After Image Apparatus, This piece of equipment is offered\nFig,51 through the courtesy of \u00a5,N, Kellog, Columbia University,\nFor discussion see the American Jounnal of Psychology,\nJanuary 1929, from which the following brief description is quoted. The cut, (figure 5l) is hero used through the\ncourtesy of this journal\u00bb (Quote page 119,)\t-\t0\t65,00\u00bb\n\"The rotating disk and its bearings and snai't are set in a square wooden box. The box has a circular opening at the front (H-H) through which the observer (beyond \"0\" in the figure) sees the disk. Its two compartments are separated by a square piece of l/S in. opal glass (G) just behind the rotating disk (I-I). The shaft carrying the disk pierces this glass at the center and is sustained by bearings at A and A\u2019(side view). The pulley (P) behind the box is conne'.ted by a belt-drive to a variable s^ed 120-y motor.\t.\nV3401 ThrosnoId Ixoka. oec or w a n of hue Masson hype, with Jal&ek on white, white on black, color on black, color on gray.\nSet of ton disks\t-\t-\t$ 10.00.\n\u00a53402\tSimp'\" Hasson Bisk (Black on White)\t-\tfS \\?\t\u00ab O O \u00bb\n\u00a54001\tOptical Bench, high grade double rod typo,\tgraduated,\t\t70.00,\n\twith 3 support clamps\t-\t\u2014\t\t\n\u00a54002\tLummer\u2014Brodhun Photometer Box\t*\u2022\t\t95.00.\n\u00a54003\tBunsen Photometer (Enclosed type)\t\u2014\t!% V\t25.00.\n\u00a53306\t3enham Disk\t-\t-\t?\t1.00.\n\u00a54004 \u00a53307\tPolarizing Photometer\t- Hering1s Contrast Box -\t-\t$205,00, ? 45.00\t\nFig.35-10\t\t\t\t","page":21},{"file":"p0022.txt","language":"en","ocr_en":"\u00a54009\nSector Disk\u00bb Lummer-Brodhun Rotating Rhomboid. Prisms\n$ 165*00.\n\u00a54010 Foot Candle Meter. An instrument by which the foot candles of illumination on any surface may be determined by direct observation* It operates on the same principle as the Bunsen photometer, the substitute for the oil spot being a row of small discs of translucent paper. One end of this row is next to a small incandescent lamp mounted inside the box and the discs are noticeably illuminated from the inside up to a certain point, depending on how much outside illumination is falling upon the discs at the particular location.: of the meter. The point of disappearance of the inside illumination, found on a scale graduated in foot candles which is placed alongside of the row of discs, gives the amount of illumination for that location. The case also contains a battery rheostat and a small volt meter for standardizing the illumination of the inside lamp. Mounted in a hardwood-metal box 20 x 25 c.m,, -\t\u00a7\nV4011\tFlicker Photometer\t-\t-\t-\t$\n\u00a54013\tSpectrometer, Spencer Student Model\t-\t-\t$\nFig. 22.\nV4014\tSpectrometer, Gaertner Model\t-\t-\t0\nV4015\tStandard Spectrophotometer\t-\t-\tv\n\u00a54017\tPhotochromatic Interval Apparatus\t-\t-\t0\nFig. 27 & 29\n\u00a55001\tPeter\u2019s Hand Campimeter\t-\t-\tv\nFig. 11\n\u00a55002\tCarr\u2019s Campimeter, including Rotator\t-\t-\t0\nFig.25\n\u00a55003\tSchweigger Perimeter\t~\t-\ts?\nFig.13\n\u00a55006 Perimeter Charts per 100 (50 Right, 50 Left)\t-\t0\n\u00a55007 Registering Perimeter. In this perimeter the chart moves\nFig,24 with the arc. Has adjustable chin rest.\t-\n...\t\u2019\t\u25a0.\u2022 }\te\nCan be supplied with color apertures 1,3,5,10 & 15 mm.\te\n\u00a55008 McHardy Perimeter, This perimeter is self-registering.\nFig*12 Supplied with color carrier having 1,3,5,10, and 15 mm.\napertures.\t-\t-\t-\tv\n\u00a55009 McHardy Electric Perimeter. This model combines the\ndaylight equipment, as in \u00a55008 with special translucent\ncolor equipment for use in dark room.\t-\t0\n\u00a55010 Marietta Perimeter. The chief characteristic of this piece Fig.30. of equipment'is thu unit for controlling the spot of color. In the simple perimeter in common use the brightness of the color spot undergoes frequent changes on account of varying relations to the source of light. The design here presented uses a small box containing lamp and set of color filters in place of the usual disk and reflected light. Constant brightness is thus maintained. The\n35.00.\n225.00.\n135.00.\n525.00.\n635.00.\n55.00.\n22.00.\n95.00.\n25.00.\n2.00.\n49.00.\n57.00.\n160.00.\n250.00.","page":22},{"file":"p0023.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig. 34\nFig. 35\nFig. 37\nFig. 39\nFig. 36\nFig. 40","page":23},{"file":"p0024.txt","language":"en","ocr_en":"sizo of the color area is controlled by moans of a diaphragm.\nThe various filters are placed in position in front of the\nlamp by means of a control on the back of the box. The\nexposure is effected, and the duration of it controlled by\na camera shutter mechanism. The disturbing factors of\nexpectation and fatigue are more easily controlled than in\nthe usual procedure.\t-\t-\t-\t0 95.00.\nV6001 Monochromatic Colorimeter ( Description & price on application).\nV6002 Dichromatic Colorimeter (Description & price on application).\nV6003 Trichromatic Colorimeter, Additive Type\n(Description and price on application).\nV6004 Trichromatic Colorimeter, Subtractive Typo\n(Description and price on application).\nV6005 Standard Spectrophotometer (Description and price on application.)\nV6006\tMarietta Color Analyzer, This device provides a practically useful,\nFig.43. rapid and inexpensive method of analysis by using a set of\n\u2022approximately monochromatic filters. It eliminates much of the tedium and inexactness of suspended judgment which occurs in the equality of brightness method. To this end, a \"ladder\u201d effect is secured in the comparison field, by introducing a short neutral tint wedge, the surface of which is interrupted by narrow opaque strips producing three horizontal fields of slightly different brightnesses. The judgment of equality is thus facilitated by the judgment of \"greater\" and the judgment of \"less\" which the upper and lowe fields when the central field is balanced with the test field. By this means the judgment of equality is made with much greater ease, rapidity, and certainty.\nIt overcomes the difficulties of securing accurate readings of very small intensities. The ordinary spectrophotometer encounters both a mechanical and visual difficulty in this regard. Photometer devices such as the sector disk, and the adjustable wedge present a mechanical difficulty in making very small changes, such as small fractions of one percent.\nAlso at such small measures the amount of light reflected calls for considerable dark adaptation to secure accuracy of comparison.\nTo overcome such difficulties, the Marietta Color Analyzer combinds two principles, namely that of the inverse square law and that of the differential Maxwell disks. Black and white disks of known reflection coefficients, controlled by differential rotator, are used on the one hand, while on the other the point source of light is moved as close as necessary to the (dark) sample. The reading for percent of white is afterward corrected to compensate for the differences in distance between the light and the two surfaces. Thus the mechanical and the visual difficulties are both overcome at the same time. -\t\u00a7 155,00.\nV7001 Bonder\u2019s Test, The Edridge-Green Lantern. This tester consists of four disks which may be revolved separately, affording a considerable variety of colors, with smoked and ribbed glasses to simulate fog and snow. The disk is illuminated by electric\nlamp.\t-\t-\t-\t-\n$\t97.00","page":24},{"file":"p0025.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig. 42\nFig. 45","page":25},{"file":"p0026.txt","language":"en","ocr_en":"V7002 Scripture\u2019s Test, In the front of this device are three windows, filled with dark smoked glass, ground glass, and light smoked glass respectively. The back of the instrument consists of a movable disk carrying twelve glasses of different colors, mostly reds, greens, and grays. The most important merit of the instruments described by its inventor is its usefulness in detecting the presence of color weakness. This is the Donders principle in a much simplified form. It is ordinarily to bo used with daylight.\t-\t-\t~\t$ 45,00,\nV7003 The Williams Lanterna. This device contains a disk holding 18 pioces of colored glass, seven shades of red, five of green, two of blue, one purple, one yellow, one smoked, and one clear. It is so illuminated that one, two, or three lights may be made visible at one time. Equipped with rheostat,\t$\t83.00.\nV7004 The Thomson Lantena. Similar in general principles to V7003, equipped with two disks, each containing seven test glasses.\nThe disks can be used separately or in combination. -\t0\t63.00,\nV7006 Jennings Tost. This set consists of two boards each bearing a set of 64 colored skeins, with a perforation opposite each skein. There are also a sot of test skeins. A record blank is placed underneath each color board, and the subject is asked to make a mark in the perforation opposite each sample which in his opinion matches the test skein presented. -\tO 27.00.\nV7007 A Holmgren Test, 125 colors\nV7007 B Holmgren Test, 100 colors\t-\nV7007 C Holmgren Test, 40 colors\t-\nFig.31 A set of colored worsted yarns with metal tags. The odd numbers on tags denote match skeins and even numbers confusion skeins. Skeins 1 to 20 consist of various shades and tints of green alternating with confusion colors, grays, tans, light browns, etc. Numbers 21 to 30 indicate darker shades or rose alternating with blues and numbers 31 to 40 indicate reds alternating with browns, sages and dark olives.\n0 15.00. 0 12.50. 0 10.00.\nV7011 Stillings Test. (18th Edition) This well known test, adopted by the U. S. Navy, TJ. S. Army and many other institutions, consists of a series of color plates composed of color mosaics so arranged as to reveal patterns to normal vision but not to the color weak or color blind.\nThis last edition contains soveral new plates which considerably extend the range of usefulness of this standard test, including the testing of illiterates. -\t-\t010,00\nV7012 Ishihara Test. This test incorporates the same principle (Fig.28) as the Stilling Test. It consists of sixteon plates, seme\nof which are very ingenious. For instance, on one plate the color blind sees a figure which is imperceptible to the normal eye, - -\n010.00","page":26},{"file":"p0027.txt","language":"en","ocr_en":"0 26.00\nV8001 Hering Falling Beads Apparatus.\t-\nFig.44 The observer looks through a tube and slit into a box which is open on both sides. In the box there is set up at any-desired distance a little standard with a white knob which stands out clearly against the background* While the eye is fixed on this, beads are allowed to drop through the small holes which are arranged one centimeter apart in the cover of the box, and in each case the observer is to decide whether the bead has fallen in front of or behind the knob. The purpose of using falling beads instead of fixed objects is to avoid parallactical displacements such as would occrir in case of movements of the head and eyes. Since moreover the beads are different in size, the only criterion for determining the distance of the falling bead from the knob, when one eye is used for observation, is the degree of clearness, whereas disparation comes into play when both eyes are used. Since one\u2019s judgment is correct when both eyes are used, biit very uncertain and often absolutely incorrect when one eye is used, the experiment shows in a clear way the importance of binocular vision for the determination of depth.\nV8002 Hillebrand Edge Apparatus,\t-\t-\t$ 64.00.\nThe purpose of the apparatus is to present to the eye objects at different distances in such a way that the judgment of the distance is possible only on the basis of accommodation.\nOn a horizontal flat base there is fixed a short vertical axis about which revolve two horizontal arms. On these arms, slides carry vertical screens. The inner vertical edges of these two screens, which are the objects that are to be judged as to distance, are sharp and exactly parallel thus excluding all secondary clues to the determination of depth. The eye of the observer is over the center of rotation of the two arms, and looks through a short removable tube with an elliptical opening toward the front. The tupe is placed in a screen which conceals the other parts of the apparatus* The background is formed by the frosted glass which is illuminated by lamps. The two arms are so joined by a curved piece at the far end that, when they are turned the edge of one screen comes into the field of vision at the very instant when the edge of the other screen has left it. In this way a quick change of the two objects can be brought about.\nV8101 Reflection Stereoscope, Wheatstone, Simple model.\nFig.35-3 Consists of a pair of vertical mirrors set at an appropriate Fig.35-4 angle, and a pair of vertical support frames for carrying\nthe stereoscopic cards.\t-\t-\ty 37.00.\nV8102 Reflection Stereoscope, modified by Hering. (Known as the\nMirror Haploscope.) A more elaborate model of the Wheatstone principle.\t-\t-\t-\t0125.00.\nV8103 Demonstration Reflection Stereoscope, (Titchener\u2019s combined\nFig.40. Storooscope, Telestereoscope and Pseudoscope) -\tv 75.00.\nV8104 Refraction Stereoscope, Brewster, Simple form. -\t0\t2.00.\nFig.38.\nV8105\nRefraction Stereoscope, Removable partition\nc\u2018*\nV\n7.50","page":27},{"file":"p0028.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig. 48\nFig. 50","page":28},{"file":"p0029.txt","language":"en","ocr_en":"V8106\nRefraction Stereoscope, with clips for auxiliary prisms\nV8107\nV8108\nV8109\nV8111\nV8112\nV8113\n\u00a58114\nV8115\nV8117 Fig. 35'\nV8118 Fig.35'\nV8119\nV8120\n\u00a58121\nRefraction Stereoscope, Brewster, with differential prisms (opposite revolving pairs)\t-\nTube Stereoscope (Ludwig's Tropostereoscope)\t-\nTube Stereoscope, special type known as the \"amblyscope\" suitable for detection, and correction by practice, of various forms of heterophoria.\t-\nWith electric illuminating attachment -\t-\nFilter Stereoscope, often called \"anaglyph\", \"plastograph\" dtc. Consists of two-colored stereograms with paired color filters for observation. Especially useful in emphasizing the function of double images, as the stereograms are superimposed one on the other, and the \"crossed\" and \"uncrossed\" disparities are very obvious. Per dozen -\t-\nBinocular Alternation Stereoscope, (M\u00fcnsterberg.)\nSimilar in general appearance to the Stroboscope, but has slits for right and left eyes in alternating positions 30' apart, and the corresponding right and left halves of the Stereograms in a circle at successive positions 40* apart.\nProjection Stereoscope. Polarizing Typo (Scripture).\nUses a pair of projectors, before the objective of one of which is a vertical polarizer, and before the other a horizontal polarizer. The observer uses an eye piece consisting of a pair of analyzers, (Price on application.)\nProjection Stereoscope. Filter Type. Similar in principle to the \"anaglyph,\" Set of 5 slides, and pairs of projection filters and of observing filters.\t-\t-\nProjection Stereoscope. Synchronized Alternation Type. Projection shutters and observation shutters synchronized. Similar in principle to the M\u00fcnsterberg device, \u00a58112.\n(Price on application.)\nMirror Pseudoscope\t-\t-\t-\n\u25a05\nMirror Pseudo scope\t-\n\u25a06\nTotal Reflection Pseudo scope (Wheatstone-Dove)\t-\nLenticular Pseudo scope (Wheatstone-Wood)\t-\nStereoscopic Cards. Combination SGt. This set consists of 5 parts, with a total of 50 cards, arranged as follows;\t-\t-\t-\nPart I Heterophoria Cards Part II Fusion and Rivalry Cards Part III Stereograms (Geometrical designs)\nPart IV Stereoscopic photographs Part \u00a5 Lustre Cards\n$ 7.00.\n047.00. $37.50.\n$23.00.\n052.00.\n0 3.00.\n$ 45.00\n$ 25.00\n0 65.00.\n0 45.00.\n0 72.00. 0 35.00.\n0 17.50.","page":29},{"file":"p0030.txt","language":"en","ocr_en":"V8201 Illusion Cards. Set of 10 cards. Size about 4x5 inches\nV8202 Arrow Head Board\t-\t-\t-\nV8203 Illusion Card. When rotated shows various illusions of Fig.35-12 motion effects, (also shows the Benham disk color phenomena.\t-\t\u2014\t-\nV8204 Anglo Illusion Card. The superimposed black cut out card Fig.35-13 swings out of position showing the straight line, and back into position showing the angle illusion -\nV8302 Stereoscopic Motion Apparatus, Filter Type. This device is designed for individual use. To the variation in disparity is added a suitable variation in size of images. The variation of disparity is produced by the rotation of two sets of paired prisms, while the change in size is secured by a pair of diaphragms.\t-\t-\tv 78,00\nV8303 Antirheoscope (James). Apparatus for illusion of reverse\nFig.35-14 motion.\t-\t-\t$ 43.50\nV8305 Illusion of motion apparatus. This device provides a means Fig,49 for presenting pairs of luminous stimuli at variable distances, variable intervals and in variable directions from each other.\nTwo radial arms carrying lights which may be at variable distances from the hub may bo separated by a variable angle and rotated at controllable speeds. Paired apertures in the screen may be arranged in a great variety of positions and illuminated at desired intervals ana sequences.\t-\t-\t$ 115.00\nV8306 Illustion of motion apparatus. This piece of equipment is Fig.50. offered through the courtesy of Leonard Carmichael and\nHarold ' Schlosberg, Brovm University. For discussion of\nthe use of this device see The American Journal of\nPsychology, January, 1928, from which the following brief\ndescription is quoted. The cut, (figure 50) is here used\n-t-hvcpn-h the couhtesy of this journal.\t$75.00\n0 7.50.\nvlO.00.\n$ 1.00\n0 2.00\nn The present machine uahes it 7 ah. !.. hr present under contre'..lee and varied conditions, all of these visual illusions that depend upon what has boon termed by Thompson, from its similarity to the movement used in cleaning a uish, a rinsing motion, A rinsing movement may be described as a movement in which the stimulus-object is revolved in a circle, at a given distance from the center, ov.t maintains a fixed orientation so that it docs not rotate about an axis within itself.\nAmong the factors that it is possible to vary when the device here described is used, beside the actual form and c< ?.or of the stimulus patterns, are: l) the speed of the rinsing movement; 2) the extent of the excursion, i.e. the distance of the circle inscribed by the center of the stimulus design from the true center of rotation; and 3) the distance of the 0 from the object,\nEssentially, the device consists of two sprockets of an equal number of teeth, coupled by means of an endless chain, so that when one sprocket is driven, the other also turns at an equal rate of speed. Thus all corresponding radii of the two sprockets always remain parallel and when a connecting yoke or strip is attached by a pivot to a pair of these corresponding radii, at points equi- **","page":30},{"file":"p0031.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig. 52\nFig. 54","page":31},{"file":"p0032.txt","language":"en","ocr_en":"V8307 Fig.52\nV8308 Fig.53.\nV8309\nV9001 Fig.46 & \u00e0 35-15\nV9002 Fig.34.\ndistant from their respective centers, this yoke will be moved with a circular motion, but not rotated; i.e.the motion imparted to the yoke will be the rinsing motion previously described.\nIn the following description the numbers in parentheses following the names of the parts refer to the indicated points in the accompanying cut. The sprockets l) and chain 2) are placed behind the upright support 3). The yoke 4) is attached to arms 5) mounted on the same shafts 6) as the sprockets, but on the opposite side of the upright support 3). A board 7), made of soft wood, is mounted on the yoke, and to this base the stimulus patterns 8) may be attached by means of thumb tacks.\nThe device may be operated by hand by means of a crank 13) or by a small electric motor and reducing gears. A range of 50-400 R.P.M, will be great enough for the demonstration of most of the illusions requiring this typo of motion, \u00bb\nIllusion of Motion Apparatus. Consists of a cardboard disk\ncontaining 120 radial stripes, to bo placed on the turn table\nof a phonograph, and rotated at approximately one revolution\nper second. It is viewed through an intermittent shutter\nmounted on an A.C, vibrator.\t-\t-\t017.00,\nIllusion of Motion Apparatus\t-\t-\t019,00.\nIllusion of Motion Apparatus.\nThis device uses the same stroboscopic radial stripe disk as V8307, but rotates it by means of variable speed motor suitably mounted for class room demonstration. The upper half of the disk is shielded from daylight, and is illuminated by neon lamp, which on 60 cycle A.C. current gives 120 clean cut flashes per second. With proper regulation of the rotation rate of disk, the stripes appear to move slowly forward, slowly backward, or stand still. Equipped with induction motor having centrifugal governor,\t-\t-\tv 45.00.\nPromotion Tachistoscope. This instrument consists of a pair 47 of film projectors and variable sector timing disk. The latter is rotated at one revolution per second by small self-starting synchronous motor. The disk openings provide various fractions up to l/5 second. The rotation auto-naticdly ceases at end of one revolution.\nThe exposure material is printed on non-inflammable standard width film, and consists of about 150 \"frames\" of digits, letters, nonsense-syllables and words.\nThe double projector method provides for accurate control of relative brightness of preexposure and exposure field.\nEspecially suitable for group use.\t\u00ff 142.00.\n\u2019 Tachisposcope. Pendulera Disk Type, Contacts for electrical time marker to indicate exact duration of exposure. The rate of fall is regulated by means of variable pendulum bob, and variable open sector, Exposure limits, 49 and 9 hundredths of a second. Size of exposure window, about 4-g- x lx inches. The whole mechanism, is mounted in a case about 3 x 14 x 14 inches, the lid of which when open serves to support the instrument in the vertical plane.\t-\t-\t0 50.00.","page":32},{"file":"p0033.txt","language":"en","ocr_en":"V9003 Fig.37*\nV9Q04 Fig. 39\nV9101 Fig,54\nV9102\nFig,55.\nV9103\nFig.35.\nTachistoscope. Drop type, with contacts for electrical time marker to indicate exact duration of exposure. The rate of fall is regulated by means of an adjustable brake, operating on the guide bar* The exposure window is about 3\" x 7g.\nThe whole mechanism is mounted in a case about 2 x 14 x 14 inches, the lid of which when open serves to support the instrument in the vertical plane.\t-\t-\t0 37.50\u00ab\nTachistoscopo. (Falling Ball Type.) This consists of an upright metal screen about 27 inches high and 15 inches wide. On the back of the screen, at the top, is a row of equally spaced pins projecting horizontally. Across the openings between the pins is a bar parallel to the screen which servos as a support for steel balls placed between the pins. This bar may bo moved away from the screen by means of a small lever. This action causes the balls to fall at the saine instant. The maximum opening of the exposure window reveals the falling balls for l/20 of a second, A scale on the back of the screen indicates nine other opening widths.\nEach scale division indicates a difference in exposure time of 5 thousandths of a second. The width of the opening is easily regulated by means of two finger nuts, -\t-\t0 48.00*\nExposure .apparatus* Mounted in a vrooden case about 14 x 14 x 2 inches , which when opened, serves as an operating support, this device consists of a disk about 11 inches in diameter, divided into 21 sectors, on each of which is printed a stimulus word. An opening in the case serves as an exposure window (about 1 x 2-|- in,). The disk is moved by means of a r\u00e4chet device that arrests each sector in proper position before the window.\t-\t-\tv 50.00.\nExposure Apparatus. The material is printed on strip of standard width moving picture film. Each \"frame\" is placed in position by means of a cable release. The device is mounted in a carrying case about 13 x 13 x 3 inches. The exposure window consists of an aperture in the cover of the case.\t-\t0 80.00.\nReading Tachistoscope, This piece of equipment is offered through the courtesy of Francis p, Robinson, The Stout Institute. For discussion of the procedure for which this device was developed, see the American Journal of Psychology,\nJanuary, 1934, from which the following brief description is quoted. The cut, (figure 35) is here used through the courtesy of this journal,\n\" It will be noted that this exposure device allows the reading of the printed material (as much as 20 lines) dov/n to the shield (A) which covers one line. When 0 reaches the end of the last visible line and jumps back to it he ro the first of the next line will begin, he presses the key (B) which causes the covered line to be exposed for 100 cr. The pressing of this key releases an unbalanced rocker-arm switch v/hich has contacts on either end.\nDuring part of the swing of the falling arm, both contacts are out of their mercury cups which breaks the circuit to the magnets that hold the exposure arm up. The distance of the fall of this rocker-arm determines the interval of exposure. Thus the time interval can be changed by raising or lowering the mercury cups.\nThe P.E\u00ab of such a timing device is about 4 <T. The reading lamp (C) illuminated the material and the mirror (D) is used for checking the location of the reading material as it is rolled up on roller (E) after each exposure. To obtain the usual tachisto-scopic set-up, single sentences were exposed behind this arm without any preceding reading matter.\"","page":33},{"file":"p0034.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig, 57\nFig. 59\nFig. 62","page":34},{"file":"p0035.txt","language":"en","ocr_en":"MARIETTA APPARATUS COMPANY, MARIETTA, OHIO\nPSYCHOLOGICAL EQUIPMENT\nFIG. 35-13\nFIG. 35-16\nFIG. 35-14\n222ZZ22Z222ZZ\nFIG. 35-17\nFIG. 35-15\nFIG. 35-18","page":35},{"file":"p0036.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\n>\nFig. 63\nFig. 70\nFig. 63\nFig. 68\nFig. 74","page":36},{"file":"p0037.txt","language":"en","ocr_en":"\u00c0-1001\n\u00ef\u00efis-57\nModel of Ear\n$\t35\u00bboo.\nA-2002 \u00ef\u00efaggener Sound \u00ef\u00efave Slide. Consists of five wire forms, the rotation of which demonstrates very effectively the geometry of wave motion. Mounted for use with a projection lantern - $ 19*00.\nA-2003 \u00ef\u00efave Apparatus (Ames and Bliss)\u00ab Consists of a spring steel strip about 12 feet long to which are attached at re polar intervals a series of metal cross bars carrying metal halls\n\tat each end. Demonstrates both transverse and longitudinal propagation.\t-\t-\t-\t$\t13*00.\nA~2004\tCrova1 s Disk\t-\t-\t-\t$\t1,00.\nA-2005\tDuring Fork (Adjustable. Range one octave. Unmounted.)\t$\t1.50.\nA-2006\tDuring Forks (Adjustable weights, C to F sharp and 3 to C.) Per Pair\t-\t-\t-\t$\t4.00.\nA-2007 Fig.-70.\tDuring Fork (Mounted on good quality resonance box with hammer. Single fork C, E, G-. or C1 .)\t-\t$\t7.00.\nA-200S Eig\u00bb720\tSet of During Forks (Four, G, E. G and C , moulted as above.) Per Set\t-\t-\t-\t$\t22.00.\nA-2009\tSet of During Forks (Eight forks, C-C\u2019, mounted as above) Per Set\t-\t-\t\u2014\t$\t40.00\nA-2C10\tSet of During Forks (One octave, urmounted.) Per Set\t$\t15.00.\nA\u20142011\tDuring Fork Weights (Pair of nickel plated adjustable weights, with thumb screw, to fit any of above.) Per Pair\t$\tI.65.\nA-2012 Eig.69\tDisk Siren (Diameter 25cm. Doothed edge. Five rows of holes, four giving major chord, and fifth unequally spaced, producing noise only.)\t-\t\u2014\t$\t3.00.\nA-2013\tDisk Siren (Same as above, but with eight rows of holes giving octave of diatonic scale.) -\t-\t$\t4.00.\nA~20l4\tDisk Siren (Same as I1-2-12 but with smooth edge.)\t$\t2.50.\nA-2015\tDisk Siren (Same as I1-2-13 but with smooth edge.)\t$\t3.50.\nA-2016 Fig\u00ab56\tAir Jet Attachment (For use with Disk Siren.)\t-\t$\t4.25.\nA-2017 Big. \u00f6S\tOrgan Pipe - Metal, Pitch 1\t-\t-\t\u00bb4\u00bb s\u2019\t3.50.\nA-201S Big.66\tOrgan Pipe - Metal, Sliding Piston.\t-\t$\t7.50.\nA-2013\tOrgan Pipes (Set of four, with air chest and valves.)\t$\t60.00.\nA-2020\tOrgan Pipes (Full octave set, with air chest and valves.)\t$\t7S.00\nA-2021\tOrgan Pipe (With sliding piston, two octaves, tones and semitones marked on piston.)\t.\u2014\t-\t$\t12.00.","page":37},{"file":"p0038.txt","language":"en","ocr_en":"A-2022 Pitch Pipe (Adjustable through one octave.) A-2023 Quincke1 2s Tubes (Set of eight whistles, sounding the\t\t$\t1.25.\nPig.6l octave of diatonic scale.)\t-\t\u2014\t$\t4.00,\nA-2024 Resonance Tubes - Reservoir Type\t- Pig. 59\t\t$\t15.00.\nA-2025 Resonators\t-\t- Pig. 60\t\u2014\t$\t45.00.\nA-2O26 Interference Tubes (Quincke) rig. 71\t\t$\t2.00.\nA-2027 Acoustic Chart (Hitching1s\t-\t\t$\t1.00.\nA-2023 Sonometer\t-\t- Pig.64\t\t$\t10.00.\nA-2029 Sonometer\t-\t- Pig.65\t\tS\t10.50.\nA-3001 Galton Thistle\t- Pig.53\t\u2014\t$\t7.50.\nA-3OO2 Galton Whistle - Improved Type, by Edelmann Pig.74\t\u2014\t$\t65.OO.\nA-3IOI Simple Acoumeter - Palling Ball Type Pig.35-16\t\u2014\t$\t42.00.\nA-8102 Discrimination Acoumeter\t- Pig.35-17\t\t$\t85.00.\nA-3201 Sound Hammer\t- Pig.35-18\t\t$\t75.00.\nA-33OI Audiometer (Trimble) (Description on application) A-3302 Audiometer (Graybar)\t*-\t?\t285.00.\nPig.73\tThis consists of three essential parts:\t\t$ 550.00.\t\n1.\tAn eight frequency Oscillator\u00bb\n2.\tA2i Attenuation Potentiometer, for regulating the volume of sound\u00ae\n3c A Heceiver\u00bb\nThe Audiometer is a generator of approximately pure tones which may he varied \"both in pitch and intensity at the will of the operator. The oscillator has a frequency range which extends from 64 to 8192 double vibrations per second. This range is divided into eight steps of frequency, 64, 128, 25'-', 512, 1024, 204S, 4096 and 8192 cycles per second. The desired step is selected by the operator by means of one of the keys shown. These keys control the oscillator coils and condensers, and the circuits are arranged so that if two keys are throvm at one tine no oscillation is produced, thus preventing incorrect results.\nThe attenuation potentiometer consists of a resistance network connected to a twenty-four point switch which sdrvcs to vary the output of the oscillator. Tire values of the resistance elements of this potentiometer are such that the movement of the -switch","page":38},{"file":"p0039.txt","language":"en","ocr_en":"from one point to the next causes a change of five sensation units in the output, the sensation unit corresponding to approx-imately the smallest fractional change in intensity perceptible to a person of normal hearing.\nThe receiver is of the watch case type and is of high wuality and efficiency.\nThe signal lamp, operated by a push button, is provided so that the person under test can indicate silently whether the test tone is heard.\nA\u20143303 Audiometer\t\u2014\t\u2014\t\u201c\t$ 235\nThis Audiometer is especially designed for commercial tests and when used for such tests offers the following particular advantages.\nIt can be operated from a standard 110 volt, 60 cycle alternating current lighting curcuit.\nTire operator need not have medical or technical experience to secure accurate readings, because the instrument is simple in design and easy to operate.\nTests can be made quickly without sacrificing accuracy because of the simplicity of design and the ease of operation.\nThe tone produced by the audiometer always has the sane frequency characteristic and volume -when the pointer of the attenuation potentiometer is on the same point.\nThe readings are given directly in percentages of hearing loss.\nThe tests and the readings cannot be influenced by the person undergoing the test.\nKo tests, adjustments, or replacements of batteries or other apparatus are necessary.\nMethod of Testing\nThe object of measurement is to determine the faintest tone the person being tested can hear. To determine this the usual procedure is to begin with an intensity which is clearly audible. Upon hearing this tone, the person under test presses the signaling button held in the hand, lighting the signal lamp. The potentiometer pointer is then slowly turned by the operator towards \"0\" until the person under test no longer hears the tone. He signals this fact by releasing the button, extinguishing the lamp. Thus the exact measurement of the person*s hearing is obtained. 3y the use of the tone interrupter the operator is enabled to check the accuracy of the signals.\nA-3304 Audiometer (Graybar)\t-\t-\t$ 175\u00ab\nThis Audiometer consists of a spring motor phonograph using a magnetic reproducer instead of the usual acoustic reproducer.\nThe magnetic reproducer picks up the vibrations originated by the record and transforms them into electrical vibrations.\nThese in turn are conveyed to the telephone head set, by this transformed into sound waves, and delivered to the ear of the person or persons under examination who hear as if by telephone.\nAll the necessary electrical energy is developed by the magnetic reproducer. Ho batteries or other outside sources of electrical energy arc required.\nThe 11-2-42 3 Audiometer can be arranged so one person alone or as many as forty persons can be tested simultaneously under identically the same conditions.\nIt is simple to operate as a phonograph and is equally rugged and free from complicated adjustment.","page":39},{"file":"p0040.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig. 77\nFig. 81","page":40},{"file":"p0041.txt","language":"en","ocr_en":"a-4ooi Fig. 63\nA-4002 ?iS.62\na-4003\nc-1001 Fig. 75\nC-1002\nFig.79 c-1003\ns-1001\ns-1101\nFig.76\nS-1201\nFig.SO\nS-1202\nFig. 35-\nS-13OI Pig.7S Fig. 35-\nIt avoids the variations that creep into whisper and watch tick tests.\n\u00ef\u00efith it, either ear can he tested separately.\nThe pupil by writing down the numbers heard indicates definitely \\fhere in the range of sound the ear recognizes sounds, and is able to interpret them correctly.\nSound Cage\t-\t-\t\u2014\t$ 65.00.\nSound Cage (Titchener)\t-\t-\t$ 175*00.\nTonal Apparatus for Phase Control (Trimble)\nDescription on application.\nOlfactometer\t-\t-\t-\t$\t35*00.\nOlfactometer\t\u2014\t-\t-\t$\t45.00.\nSnell Solutions (Set of ten in bottles)\t-\t$\t5*00.\nHubber Stamp (for cutaneous sense napping)\t-\t$ 1.00,\nAlgesioneter.\t~\t-\t-\t$\t5*00.\nTemperature Cylinders (Set of six with holder)\n$ 3.00.\nHeat Grill\t-\t-\t-\t$\t5*00.\n\u25a019 This device is offered through the courtesy of Harold Schlosberg, Brown University. For discussion see the American Journal of Psychology, January 1931\u00bb from which the following brief description is quoted. The cut, figure 35-19, is here reproduced through the courtesy of this journal.\n'\u2022The new grill consists essentially of two comb-like elements, one of which nay be warned, and the other chilled, by immersion in pans of water. 3y interneshing the teeth, and placing then on the surface of the skin, alternate warn and cold rods stimulate the skin.\n15The experimenter places one element in cold water (about 20\u00b0C), and the other in warn (about 40\u00b0 C). He allows several minutes for the elements to come to the temperature of the bath, then removes then and shakes then free of water. The rods are then interneshod. The S then rests his wrist, and later his palm, on the interneshod alternate warm and cool rods. An experience of heat is almost invariably reported.\nElectromagnetic Aesthesiometer. This devise is offered through the courtesy of Uilbur S. Hulin, Princeton University. For\n\u202220 discussion see the American Jounral of Psychology, July 1929\u00bb from which the following brief description is quoted. The cut, figure 7^, is here used through the courtesy of this journal.","page":41},{"file":"p0042.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig. 83\nFig. 84\nFig. 88","page":42},{"file":"p0043.txt","language":"en","ocr_en":"''The instrument consists of a solenoid within which an iron plunger is held suspended as long as the circuit is completed through the coil. When the circuit is \"broken the iron plunger (i.e. the stinulus-point) descends upon the skin \"by gravity.\nThe intensity of the stimulation is determined \"by detachable \"brass slots (grooved so as to be fastened with a set screw to the iron plunger above its inner bend.) The stimulus\u2014point is set out to the edge of the solenoid so that the points of two such aesthesioneters may be brought together fro a zero spatial separation. The brass guide-rod prevents the iron plunger from pivoting around, and the nut at the lower end of the guide-rod prevents the plunger from balling out altogether when the current is broken. While the plunger find appended weight are permitted a maximal excursion of more than half an inch,, the plunger properly should not fall more than half a millimeter to the skin so that the skin will merely be pressed and not struck with a jarring impact. The snail excursion is determined by the amount of rubber sponge which is transfixed on the upper portion of the guide-rod.1*\nS-I3O2\t\"Von Frey\u2019s Threshold Scale\t-\t\u2014\t$ 52.00.\nFig.g6\nS-I303\tHair Aesthesiometer (Bujas)\t-\t-\t$ 7*00.\nThe hair is contained in a glass tube which servos as handle. The end of the tube from which the hair protrudes is fitted with a small spring clamp which permits easy adjustment of the length of the hair to be used. Behind the hair, inside the tube, is a scale reading fron O-7O m. The position of the end of the hair against this scale indicates the length of the pant extended.\ns-1304 Fig. 95\tTwo Point Aesthesiometer. (Ungraduatcd)\t-\t$\t2.00\nS-1305 Fig.94\tSpearman\u2019s Aesthesiometer (Graduated)\t-\t$\t15.00\nS-I306 Fig.SI\tTactual Perception Board\t\u2014\t-\t$\t5.00\nS-l401 Pis\u00bb77\tElbow Movement Board\t-\t-\t$\t10.00,\nS -l402\tDiscrimination Weights (Set of 21)\t-\t-\t$ 22.00,\t\ns-i4ii Pig.87\tSize Weight Illusion\t-\t-\t$\t7-50,\ns-1403 Pig.82\tTemporal Finger Maze.\t-\t- This device is offered through the courtesy of Hoger G\u00ab\t$\t25.00,\nBarker, Stanford University. For discussion seo the American Journal of Psychology, October 1931\u00bb from which the following brief description is quoted. The cut, figure 82, is here used through the courtesy of this journal.\n\u201d The blindfolded subject starts at point S, Fig.3 (see also the position of the subject\u2019s finger in Fig.2); this point is indicated to the subject by a small tack head.. He proceeds toward the center","page":43},{"file":"p0044.txt","language":"en","ocr_en":"of the intersection, B, which is indicated by a round-headed upholstery tack\u00bb Fron the center of the intersection, the subject may proceed by one of the four radiating paths, 1,2,3\u00bb and 4 (Fig.3); he has to find the correct one by motor exploration. This correct path is the only one not blocked by a wire post, 1/3 in. in dian. and 3/lb in. high. These posts nay be removed at the will of the experimenter by manipulating the levers I, II, III, and IV. The leavers extend beneath the board panel, and are hinged to it at the end near the subject (Fig.2).\nHoles 3/lb in. in dian. are made in the center of each radiating path 1-| in. from the center of the intersection. One of the levers extends below each of these holes and carries a metal post so placed that when the lever is against the panel (i.e. not pressed by E) the post will project above the trough of the path c/i6 in. The levers are held against the panel by silently acting springs. Thus, all paths are closed until E opens one by depressing a lever<>\n1,E depresses the levers in accordance with the formula for the particular patern S is learning. If the problem requires that path I be learned first, E depresses lever I and holds it down until S finds his way out over the peg hole\u00ab E then allows the spring to return the peg, and depresses the lever corresponding to the next correct choice in the pattern. It is only necessary for E to have before him the numbers indicating the order in which the levers are to be depressed.\n\"Certain advantages: (l) it is light and compact; (2) the pattern is easily and exactly described; (3) a very large number of maze patterns are immediately available, the same piece of apparatus serving for all the patterns; (4) successive choices in one direction does not carry 31s hand far to one side predisposing to choices in the opposed direction; and (5) S may be allowed to see the paths with all pegs in place before he begins, he thus understands exactly the nature of the situation, but learns nothing of the details of the choices to be made,\u201d\nP-1001 Instructions Box. A test of ability to follow directions. $ 35.00.\nFig.33 (Diel)\nP-2001\tComplication Pendulum\t-\t-\t-\t$\t85.00.\nFig. 84\nP\u20142002\tComplication Clock\t-\t-\t-\t$\t65.00\nFig. S3\nP-3001\tMirror Drav/ing Apparatus\t-\t-\t-\t$\t32.00.\nP-3011 Freeman\u2019s Puggle Box (Test of Mechanical Intelligence) -\t$ 45.00.\nFig.39.\nP-3002\tGoddard\u2019s Form Board\t-\t-\t-\t$\t6.50.\nFig.91\nP-3OO3 Test of Mechanical Intelligence\t-\t-\t$\nFig. 93\nP-3004\tPacking Blocks Test\t-\t-\t-\t$\t7.50.\nFig.96\nP-4001\tVernier Chromoscope\t-\t-\t-\t$\t27.00.\nFig. 90\nP-3007\tPuzzle Board\t\u2014\t-\t\u2014\nFig.35~32\tThere are ten movable parts; when these are operated\nFig.35\u201c33\tin the proper sequence, the disk becomes removable.\n(Sane as Fig. 101.\n$ 35.00","page":44},{"file":"p0045.txt","language":"en","ocr_en":"P-4002 Modified Sanford Chronoscope.\t-\t-\t$ 30.00.\nPig.92\tThis improved form of the Vernier chronoscope is offered\nthrough the courtesy of Porrest L. Dimmick, Hohart College.\nPor discussion see the American Journal of Psychology, July 1929, from which the following \"brief description is quoted.\nThe cut, figure 95\u00bb is here used through the courtesy of this Journalo\n\u2022'Everyone who has occasion to use the Sanford pendulum chronoscope is aware of certain disadvantages inherent inthe instrument, not the least of which is the impermanent and variable nature of the mode of suspension of the pendulums.\nStudents in the elementary laboratory are unable to adjust the threads accurately in a reasonable time and even after adjustment is attained it lasts for only a short time. It is customary to have the student check the accuracy of the pendulums at the beginning of every laboratory period, but in the writer's experience, the relative accuracy of the original adjustment does not last much beyond fifty reactions.\nTo overcome this particular difficulty we have worked out the following modification in the Hobart Laboratory.\n\"We.,removed the brass arm which carries the pendulums and substituted a flat piece (a) of the same length and l/2 in. by 3/i6 in. Through this new arm we drilled two tapered holes (B) 1/4 in. to l/2 in. in line with the two release buttons.\nAt a distance of 5/1^ in. on both sides of these holes we made shallow conical pits (C). At the top of each pendulum bob we drilled and tapped a l/8 in. hole and into it fitted a 1/S in. brass rod threaded at both ends. The upper end of the rod we passed through one of the holes in the supporting arm and into a cross am (D) which carries two adjustable points (e). These points fit exactly into the depressions on either side of the hole. When the pendulum is adjusted to its proper length it swings freely and without friction on its point bearings. With this type of suspension, a pendulum will swing much longer than with thread suspension.\nP-4003 Fige 97\nPig.9g\nMarietta Reaction Time Set\t~\t~\t$\t155*00.\nThis outfit consists of the following!\n1.\tA Marietta Chronoscope (Synchronous Motor Type)\n2.\tStimulus unit: a) Finger key and connections wired\nfor simple, discrimination and choice reaction experiments, b) Visual stimulus:white, red and green lights, c)\nAuditory stimulus: buzzer type, d) Visual verbal stimulus: simple exposure unit with set of association test words cards (Kent Rosanoff list), e) Lip key for verbal stimulus.\n3\u00bb Reaction unit: a) Fing r keys for simple and choice reactions, b) Lip key for verbal reaction.\n4\u00bb Complete equipment mounted on boards ready for immediate use without wiring or ither preparations.\n5\u00ab Lamps, switches and all necessary parts complete, (but without battery). (Six volt storage battery is recommended).\nAlso furnished without lip keys or word exposure window, @\n$115.00.\nDescription of Operations\nClosing switch Ho. 8 prepares circuit for chronoscope and right\nhand reaction key.\nClosing switch Ho. 7 prepares circuit for chronoscope and left\nhand reaction key.\nClosing switch Ko. 6 prepares circuit for light stimulus.","page":45},{"file":"p0046.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig-. 91\nFig. 96","page":46},{"file":"p0047.txt","language":"en","ocr_en":"\nClosing\tswitch\tNo\u00ab\t5\tprepares\tcircuit\tfor\tauditory\tstimulus\t(buzzer)\nClosing\tswitch\tNo.\t4\tprepares\tcircuit\tfor\tshutter\u00ab\nClosing\tswitch\tNo.\t2\tprepares\tcircuit\tfor\tresponse\tlip key.\nIn all of the above cases the stimulus is applied by the experimenter\u2019s finger key.\nClosing switch No. 1 prepares circuit for stimulus by experimenter\u2019s lip key, and response by subject's lip key.\nNor example, if experiment is on reaction time for discrimination and choice, and if subject is instructed to respond to red light with right hand key, and to green light with left hand key, close switch No. 6, set light unit at red, close switch No. S, and depress stimulus key. Or set light at green, close switch No. 7> and depress stimulus key.\nIn such cases if wrong reactions are made the trouble of resetting the chronoscope to zero is avoided.\nOTHER EXAMPLES:\nNor discrimination reaction using light and buzzer as stimuli and right hand key for response, close switch No. S, instruct subject to press right hand key when light is flashed, but refrain from reaction when buzzer is sounded, then close switch No. 6 or No. 5 in chance order, and apply stimulus by depressing finger key. Here again wrong reactions are indicated by a click of subject's key, but trouble of resetting the chronoscope for such wrong reactions is avoided by having only appropriate switch closed.\nIf spoken response to spoken stimulus is desired close switch No. 1 and use both lip keys.\nIf spoken response to visual\u2014verbal stimulus is desired close switch No. 2, also No. 4, and apply stimulus by pressing finger key.\n?~4oo4\nAs noted in Section / describing the chronoscope both stimulus and response are secured by closing a circuit. Set pointer of small disk at zero on time disk, instruct subject to keep key depressed for a few moments after reaction. Experimenter keeps his own key depressed until after reaction, releasing it before subject releases his. Thus the pointer disk released by the magnets then rests on the time disk and reaction time is measured by displacement of the one on the other. It is better to stop the chronoscope before the subject's key is rel\u00e8ased.\nThe chronoscope is driven by a synchronous motor which gives one revolution per second with 60 cycle A.C,\nP-3005\tMirror Drawing Apparatus (Freeman)\t\u2014\t\u2014\t$\t32.00\nThis consists of wooden base about 24xlS inches supporting a reversing writing lever and mirrors* The lever is so constructed as to produce a double reversal of the hand movements, both right-left, and foreward-backward. The mirror is freely adjustable in the horizontal plane, being hinged or pivoted at three points.\nThe lever and hand holding control stylus are concealed by black curtains on a rectangular frame supported by four uprights. For discussion see Freeman's Experimental Education..\nP-3105\tFintner-Paterson Performance Test\t-\t-\t$\t54*50\nFig*99\t(Nor details \u2014 see following page.)\n-3106\tTest of Mechanical Ability\t-\t-\t$\t45.00\nig.100\nP-3107 Puzzle Board (Test of Mechanical Ability) Pig. 101\n$ 35.00","page":47},{"file":"p0048.txt","language":"en","ocr_en":"(Pintner-Pat\u00e8rson Performance Test) (Short Scale)\n1.\tMare and Foal\t\u2014\t\u2014\t$ 4.50,\n2.\tSeguin Form Board\t-\t-\t$ 6.50.\n3.\tPaterson Five Figure Form Board\t\u2014\t$ 7.00.\n4.\tPintner Two Figure Form Board\t~\t$ 4.50.\n5.\tCasuists Form Board\t~\t\u2014\t$ 7.OO,\n6.\tMannikin\t-\t\u2014\t$ 4.00,\n7.\tFeature Profile Form Board\t-\t\u2014\t$ 3,50,\ng.\tShip Form Board\t~\t\u2014\t$ 4.50.\n9.\tHealy Pictorial Completion Ho. 1.\t\t$10.00.\n10.\tCube Imitation Test\t-\t\t$ 3\u00b000,","page":48},{"file":"p0049.txt","language":"en","ocr_en":"P-320S\nFig,103\nP-3209\nFig.l04\nP-3010 Pig. 102 Pig.105\nMultiple Choice Apparatus\t-\t-\nMultiple Choice Apparatus\t-\t-\nThis device is offered through the courtesy of E. G.\nWeaver, Princeton University, and K. E. Zener, Duke University. For discussion see the American Journal of Psychology, October 1929, from which the following brief description is quoted. The cut, Fig. 104, is here used through the courtesy of this Journal.\n\"The apparatus is shown, from the E's side, in Fig.2. S sits behind the apparatus, holding in one hand the brass electrode (t). His view of E's manipulations is obscured by the board (A). Before S, in the board (D), are twelve 1-in. holes, any number of which may be exposed at one time. The two wooden sliders (C) are provided for varying the number of holes exposed. A finger extended through one of the holes will operate akey, which is simply a brass strip (n) mounted above a screw-head (0) so as to touch it when depressed. Pressing a key completes an electric circuit and gives S a shock in the operating finger, unless the response is the 'correct' one, in which case a short-circuit of the current will have been provided by a setting of the lever (s). This lever may be set so as to make contact with any one of twelve screw-heads (n), and thus short-circuit any one of the keySo\n\"An und erstanding of the electrical connections will be facilitated by an examination of the wiring diagram in Fig. 3\u00bb Most of the wiring runs beneath the board (B), and is concealed from view. From (q), which connects with one side of the electrical supply, a wire runs to each of the screws (0) with which the keys make contact. From (p), which connects with the other side of the electrical supply, one wire runs to the electrode (t), and another to the screw (k) on which the lever (s) is pivoted. The screws (n) that are arranged in the arc of the lever's swing are connected with a corresponding key. When the lever is turned to a given screw, it is plain that pressing the key to which it corresponds will give no shock, since the current will take the path of lower resistance. Pressing any other key, on the other hand, will lead to punishment in the form of shock.\"\nMinnesota Test of Mechanical Ability.\nThe Minnesota Tests of Mechanical Ability are the outcome of a research project organized by the Department of Psychology, University of Minnesota, in 1923\u00ab The complete report of this project has been published in book form by the University of Minnesota Press. The following quotation from the Foreword of this volume, by Hobort M. Yerkes, One-time Chairman, Committee on Scientific Problems of Human Migrations. National Research Council suggests the unique significance of this work: \u2014 \"The University of Minnesota study of mechanical abilities originated in a program of research which was formulated and promoted by a Committee of the National Research Council.\" \"It is difficult for me to write calmly and objectively of this report, so stirred am I by its contribution of fact, method, and insight, and its promise of developments which should significantly improve educational,vocational, and industrial procedures.\"\n$ 125.00. $\t75.00.\n1. Minnesota Paper Form Board Series A, per 100 Series.B, per 100\n$ 3.00 $ 3.00","page":49},{"file":"p0050.txt","language":"en","ocr_en":"2. Minnesota Spatial Relations Test\nBoards A and B\t-\t$ 17.00\nBoards C and D\t-\t17\u00bb00\n3.\tMinnesota Assembly Test\nLong Fom\u00ee\nBox A\t\u2014\nBox 3\t\u2014\n3ox C\t-\nShort Fom;\nBox 1\t-\nBox 2\nAssembly Test Score Sheet, per 100\n4.\tMinnesota Interest Analysis Test, per 100\n5c\tPacking Blocks Test\t-\n6.\tCard Sorting Test\t-\n7\u00ab\t\u2019\u2019Minnesota Mechanical Ability Tests\"\n(Complete Information and Instructions).\n$\tS.50\ng.50\n12.00\n$\tg.50\ng.50\nP~4004 Marietta Chronoscope (Spring Motor Drive)\t-\nFig.106 This instrument was originally designed to meet the need for an inexpensive but reliable chronoscope for general student use in the psychological laboratory.\n1.\tDriven by spring motor the speed of which except at very high and very low spring tension, has a variability of about one-tenth of one per cent.\n2.\tThe rotation rate of time disk is regulated by means of stroboscopic pattern and pulsating light. A small lamp nay be used with either 50 or 100 d.v. (a tuning fork).\nThe disk pattern may also be used with 60 cycle A.C.light.\n(Neon lamp $1.00 extra.)\n3\u00bb When so ordered, the chronoscope is provided with a snail bibrating reed timed to 100 d.v. per second, by means of which the rotation rate of chronoscope can be regulated almost as easily and accurately as by means of the pulsating light. ( $2.00 extra,.)\n4. The stroboscopic disk carries a smaller disk, divided into hundredths, and this in turn carries a small pointer. The stimulus circuit activates an inner pair of magnets which arrest the pointer. The reaction circuit activates an outer pair of negnots, which arrest the tine disk. The displacement indicates the time interval. The scale reads at a glance in hundredths of a second.\nP~4005 The New Marietta Chronoscope.\t\u2014\t-\t$\nFig*35-27\tThis is driven by a synchronous motor or an electric\ngovernor motor. It is improved in detail, quieter in operation, and more accurate and convenient.\n(if A.C. is not available, designate D.C. voltage.\nThis motor operates at a constant speed when set for a specified voltage, within voltage fluctuations of about five percent.)\nP~4006 Interval Apparatus (incline Plane Timing Device) -\t$\nFig*35\u201c2S The inclined runway for a pair of steel balls gives, at various angles and for various positions of the stop-keys, a range of intervals from five seconds to less than one-tenth second. For the longer intervals, one ball is used, at small elevation, for the short intervals, a greater elevation, and the two balls. In the former case, the key\n$ 34.oo.\n$ 29.00.\n$ 17.co. $ 1.00. $ 2.50. $\t7*50,\n$ 6.50.\n$ 5.00.\n$ 45.00.\n55.00.\n92.00.","page":50},{"file":"p0051.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig. 97\nFig. 98","page":51},{"file":"p0052.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig. 102\nFig. 104","page":52},{"file":"p0053.txt","language":"en","ocr_en":"p-3011 Fig.IO7\nP-3012 Fig.108\nP-3013 Fig. 109\nP-3014 Fig.110\nP-3015 Fig. Ill\nP-3016 Fig.Ill\nP-3017 Fig.35-\nP-3018\nFig.35-\nwhich releases the \"ball initiates the interval, and the stop breaks the circuit. In the latter case, the stop for one hall initiates the interval and the stop for the second hall breaks the circuit. The device is empirically calibrated.\nAutomatograph.\t-\t-\t\u2014\t$ 18.00.\nThis autonatograph consists of two plate glass emits, separated by ball bearings. The upper glass thus moves very freely on the lower glass, and records movements of the arm resting on the upper glass by means of a stylus which passes through the upper glass and makes a tracing on sheet of paper on lower glass.\nSteadiness Test\n8.50.\nTapping Test\t-\t-\t-\t$\t6.50,\nPrecision Board\t\u2014\t-\t-\t$\t7*50.\nSteadiness Test.\t-\t-\t-\t$ 35*00.\nThe two hands, extended at arms length, grasp two handles.\nOne handle supports a dial mechanism, to the other is attached a cord which runs over to the dial mechanism. The task is to hold the indicator on a definite point. The slightest movements of the hands are registered by fluctuations of the pointer.\nTrenograph.\t-\t-\u2022\t\u2014\t$ 11.00.\nThis instrument is intended for a graphic recording of involuntary arm movements* The diaphragm of the tambour supports a small upright bar, on which is placed a small weight. As the tambour is held by the handle in the subjects hand, movements of the hand are registered as air fluctuations on account of the inertia of the weight resting on the diaphragm.\nGalton Bar.\t-\t-\t-\t$ 75*00.\n21\tFor the adjustment of juxtaposed, visual areas, to\nsecure judgment ox equality. (See Titchcner, Experimental Psychology, Vol. 2, Students Manual, page , and Instructors Manual, page\t\u2022\nVertical Test.\t-\t-\t-\t$ 75*00.\n22\tTest for Judgment of Vertical. The eut, figure 35-22, shows the experimenter's side of the ajjparatus. The subject faces the semi-circular window, in which a. vertical, radial rod apr>ears. The position of this rod is controlled by a knob on the subject's experimenterls side of the device.\nP-3019 Angle Test.\t-\t$ 55*00.\nFig*35-23\tTest for Judgment of Angle. Similar in general character\nto P-3OI8. The radial arms are adjusted by the subject by means of the control knob to secure division of the circular area into required parts, half; one-third; two-thirds; one-fourth; threo-fourths; etCo","page":53},{"file":"p0054.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig. 107\nFig. Ill","page":54},{"file":"p0055.txt","language":"en","ocr_en":"P-3020 Fi\u00df\u00ab35-24\nP-3101 PiS.35-25\nP-3102 Fig.35-26\nP-3021\nFig.ll4)\nP-3022\nFig.llg\nP-2023 Fig.115\nP-4007 Fig.112\nP-400S\nFig.117\np-4oo9 Fig.113\np-4010\nFig.116\nP-4oii\nFig.119\nP-4012 Fig.120\nP-5001 Fig. 35-29\nTwo\u2014hand Coordination Pursuit Meter*\nThe path to \"be followed is narked on the moving paper roll, shown in the opening. The pointer is kept as nearly as possible on the path hy means of the crank shown at the right while the paper is kept moving by the rotation of the crank shown in front. The score may be stated as the product of the fraction: allowed time as numerator, and consumed tine denominator, multiplied by the fraction: time \"on\" the path as numerator, consumed tine as denominator. (For a suitable recording device, see P-5OO3, figure 35-31)*\nLegs Steadiness Test\t-\t-\t-\t$\t95*00\u00ab\nSimilar in general principle to the \"voloneter\" (See F.N.\nFreeman, Mental Tests, page 204), but arranged so as to record success in terns of a curve indicating for successive intervals the radio of. correct to incorrect position. The recording device is similar to that shown in P-5OO3, figure 35~31\u00bb '\u25a0 but has a moving series of receptacles, the successive units receiving the correct drip for sticcessive intervals. (Recording device not included in price)\nBack and Legs Ergograph\t-\t-\t-\t$ 112.00,\nTwo Hand Coordination Test\n$ 27.00.\nVertical Radius Test Horizontal Bisecting Test Roener Sound Key Catell Sound Key Five Finger Key Mdlor-Pilzecker Lip Key\n$ 32.00. $ 40.00. $\t55.00.\n$ 4S.00. $ 20.00. $ 30.00.\nTelegraph Sounder\t\u2014\t-\t-\t$\t3*00.\nTelegraph Key\t-\t-\t-\t$2.75*\nAttention Apparatus.\t-\t-\t-\t$ 210.00.\nThis apparatus consists of a drum driven, at adjustable rates, by constant speed motor. There are ten windows and on the drum ten rows of symbols. A specified set of symbols appear in chance order at various windows. When any symbol of the set appears at any window, the subject should press the adjacent key. The device is provided with three electromagnetic counters, in which the total number of opportunities,","page":55},{"file":"p0056.txt","language":"en","ocr_en":"MARIETTA APPARATUS COMPANY, MARIETTA, OHIO\nPSYCHOLOGICAL EQUIPMENT\nFIG. 35-21\nFIG. 35-24","page":56},{"file":"p0057.txt","language":"en","ocr_en":"MARIETTA APPARATUS COMPANY, MARIETTA, OHIO\nPSYCHOLOGICAL EQUIPMENT\nFIG. 35-25\nFIG. 35-27\nFIG. 35-30","page":57},{"file":"p0058.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig.118\nFig. 114\nFig. 119\nFig. 117\nFig.115\nFig. 116\nFig. 121\nFig.122","page":58},{"file":"p0059.txt","language":"en","ocr_en":"P-5002\nFi\u00a3>35-30\nP-5003\nFig.35-31\nP-6001 Fig.35-3^\nP-6002 Fig.35-35\nP-6003\nP-6004\nFig.123\nP-6005 Fig.124\n(center)\nthe number of attempts, and the number of correct responses are recorded. Any number of the ten windows can be used.\nThus, with variable speed and variable difficulty of symbol patterns, the test nay be made as easy or as exacting as desired. With occasional change in symbol pattern, the learning effect is avoided, and a true test of attention provided.\nEpicycloid Pursuitneter.\t-\t-\t\u2014\t$ 85*00.\nA considerable range of speeds is provided, which makes this a test with wide limits of ease and difficulty. The fact that the target and surrounding area are perfectly flush makes it impossible to \"ride\" the target at ordinary pressure, and the fact that the pointer handle is flexible,\n(for vertical movement though rigid for horizontal movement), makes more than normal pressure impossible*\nDrip Timing Device.\t-\t-\t-\t$ 37.00.\nThis was designed especially for use with the Epicycloid Pursuitmeter, but may be used with other tests, such as various steadiness tests. Total times for both off and on position are accurately measured by the volume of water obtained from the drip in two positions.\nPsychogalvanic Response Apparatus.\t-\t-\t$ 137*00\nA simplified and sensitive form of the original Veraguth device. Either D.C. or A.C. may be used. Suitable for usual demonstrations procedure.\nKnee Jerk Apparatus.\t\u2014\t-\t-\t$\t55*00\nAs suggested by cut, the subject sits on the table, and the lower end of lever is propelled by a simple metal rod attached to and extending sideways from the foot. The upper end of the lever carries a stylus which traces the excursion of lever at each kick. The stylus is carried by a holder which is moved a short distance toward the pivot point of the apparatus by means of a r\u00e4chet mechanism, so that each successive movement of the lever, is traced on a fresh line. By this means a considerable number of records can be obtained on a single sheet of paper. The writing unit is quickly reset to the original position by releasing spring grip. Record forms are provided with the equipment, and are easily attached. The apparatus can be mounted so as to record movement of either right or left leg*\nWink Reflex Apparatus\t-\t-\t-\t$ 25*00\nPlethysmograph\t-\t-\t-\t$ 12.00\nThis is the simple hand and fore arm type, consisting of a nickel plated brass cylinder, 12 inches long by 4g- inches in diameter. It is provided with rubber don and three outlets. (For discussion see Jackson\u2019s Experimental Pharmacology.)\nPneumograph *(Berth) \u2022\t-\t\u2014\t-\t$ 10*50\nA simple metal cylinder, lj inches long and Lg- inches in diameter, the ends of which are closed by substantial rubber diaphragms, to v/hich are attached the straps leading around the body.","page":59},{"file":"p0060.txt","language":"en","ocr_en":"MARIETTA APPARATUS COMPANY, MARIETTA, OHIO\nPSYCHOLOGICAL EQUIPMENT\nFIG. 35-38\nFIG. 35-42","page":60},{"file":"p0061.txt","language":"en","ocr_en":"MARIETTA APPARATUS COMPANY, MARIETTA, OHIO\nPSYCHOLOGICAL EQUIPMENT\nFIG. 35-32\nFIG 35-35","page":61},{"file":"p0062.txt","language":"en","ocr_en":"P~6oo6 Fig,124 (right)\nP-6007\nFig.124\n(left)\nP-6003\nFig.125\n(left)\nCardiograph (Jacquet).\t-\t-\t-\t$\t30.00.\nConsists of an outer lead ring, leather covered, on which the capsule is adjustably supported. The arrangement is very simple and practical. Equipped with straps for attachmento\nSphygomograph (lehnann)o\t-\t-\t-\t$ 27.00\u2022\nA pair of parallel supporting rods, about 2 inches long, and about ^ inch apart, are attached at one end of a carved metal frame which carries adjustably the tube of an air capsule (3 inches diameter). The diaphragm of the capsule bears a thin disk of aluminum, and this supports a light upright post (non-netallic.) The end of this post rests upon the pulse surface between the supporting parallel rods. The whole is held in position by a leather strap attached to the supporting rods.\nSphygnograph,\t-\t\u2014\t\u2014\t$ 2S.00.\nSimilar in construction to P-6007, except that the post of the air capsule rests, not directly on the pulse, but on the back of a flat hinged spring which holds a projecting knob against the pulse. The tension of the spring against the pulse can be regulated by means of an eccentric. Also the capsule can be swung to one side, on its supporting frame, during the adjustment of the instrument to the arm.\nP-6009 Fig 125 (right) Fig.130\nPneumograph (Marey).\t\u2014\t-\t-\t$ 30.00.\nThe two parallel supporting bars, about 3 inches apart, rest upon the chest. One end of the strap is attached to the bridge piece, and the other end is attached to the long end of a lever pivoted on the bridge piece just above one of the supporting bars. The short end of this lever activates a cross bar which in turn acts on the projecting post of the air capsule. The lever1s long arm is drawn inward by a coil spring. After the straps are adjusted, fine adjustment is secured by means of a slotted attachment which regulates the positions of capsule post, cross bar and lever, with relation to each other.\nP-6010 Pneumograph ( Gutzm^nn) \u2022\t\u2014\t-\t-\t$ 6.50.\nFig.127\tA simple device consisting of a 12 inch length of\n(bottom) rubber tubing, with straps and end pieces, one of which bears the nipple for tube connecting with tambour.\nP\u20146011 Pneumograph.\t-\t-\nFig.123\tThis type consists of flexible rubber tube distended\nby a coiled spring, with metal end pieces, one of which is closed and the other of which has a nipple to which is attached the tube connecting the pneumograph with the tambour.* The tube is held in position around the chest or abdomen by a light chain and hook.\n$ 12.00.\nP-6012 Electric Pneumograph (Cason)\nP-7001 Wet Spirometer Fig. 35-36\n$ 25.OO, $ 32.00.\nP-7002 Hand Bynanometer.\nFig. 121 Push & Pull Holders Fig. 129\t\u201d\t\u201d\t\"\n$ 15.00\u00bb $ 15.00. $ 15.00.","page":62},{"file":"p0063.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig. 123\nFig. 124\nFig.125\nFig. 126\nFig. 127\n!\nFig. 129\nFig. 130\nFig. 128\nFig. 131\nFig. 132","page":63},{"file":"p0064.txt","language":"en","ocr_en":"P-7003\tBack & Leg Bynanoneter\t-\t\u2014\t~\nPig.35-37\nP-7005\nPig\u00ab133\tDry Spirometer\t-\t-\t-\nP-7006\tWet Spirometer\t-\t-\t**\nPig.134\nP-7007\tStroke Test.\t-\t-\nPig.135\nP-7004 Pneuno-dynanometer. (Mathieu) The brea.th is expelled -Pig.127\tthrough a mouth piece and taken into metal cylinder, in\n(top)\twhich piston operates so as to move an indicator over a\ncircular scaleo\t#\nP-3001\tAnthropometric Scaleo\t-\t~\t\u201d\nPig.122\nP-3002\tAnthropometer Scale.\t-\t-\t-\nPig.131\nP-3003\tStadioneter\t\u2014\t-\t\u2014\nPig.132 Standing, Sitting, Reaching\u00ab\n$ 35*00.\n$ 32.00.\n$ 20.00.\n$ 35*00.\n$ 25.00.\n$ 19.00.\n$ 43.00. $ 29.00.\n0,-1001 Kymographs. Similar in general appearance to spring drive kymographs shown in figures 136, 13S, l44, l46, hut electrically driven. The following are specifications:\nTYPE A\t-\t-\nBrass drum 6\" in diameter, driven by high grade induction motor, with built-in reduction gear. Planetary drive (wood fibre on cast iron). (This induction motor, under constant load, is practically as constant in speed as a synchronous motor.)\nThis kymograph has variable speed, secured by moving the point of contact of the driving disko Any one of the following pairs of speed limits may be selected;\n(a)\tPeripheral speed, from 5 to inches per minute.\n(b)\tir\t\"\tM\t10\tto\t25\t\"\t\"\t\"\n(c)\t\u00ab\t\"\t\"\t20\tto\t50\t11\t\"\t\"\n(a)\t\"\tn\t\"\t40\tto\t100\t\"\t\"\t\"\nTYPE B\t-\nSane as Type A, except that a change gear unit is added, by means of which either speeds (a), (b) and (c) or (b),\n( c)and (d) nay be combined.\nTYPE C\t-\nSame as Type A, but having true synchronous motor.\nTYPE D\t-\t~\nSame as Type B, but having true synchronous motor,\nTYPE AE\t-\nSane as Type A? but having a special stylus carrier which has worm-gear drive, by means of which the record is made in a continuous spiral. There are nine different speeds at which this worn nay be driven.\nTYPE BE\t-\t-\nSame as Type B, but with attachment as described in Type AE. TYPE CE\t-\nSame as Type C, but with attachment as described in Type AE.\n$ 96.00.\n$ 113.00.\n$ 120.00, $ 142.00, $ 146.00.\n$ 163,00,\n$ 170o00.","page":64},{"file":"p0065.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nPig.139\nPig. 135\nFig.133\nFig. 134\nFig. 136\nFig. 138\nFig. 140","page":65},{"file":"p0066.txt","language":"en","ocr_en":"TYPE DE\t-\t-\nSane as Type D, but with attachment as described in Type AE. TYPE AF\t-\t-\nSame as Type A, but having additional drum unit for long paper\u00bb Maximum spread\tbetween drum centres, 3 feet.\nTYPE BF\t-\t-\t-\nSane as Type B, for long paper.\nTYPE CF\t-\nSane as Type C, for long paper,\nTYPE DF\t-\t\u2014\t-\t\u2014\nSome as Type D, for long paper.\nP-3004\tFacial Goniometer\t-\t-\t-\nP-3005\tCranioneter\t-\t-\nP-S006\tCraneal Calipers\t-\t-\t-\nFig.35-33\nFig.35~39\nQ-1101\tKynograph Smoker,\t\u2014\t\u2014\t\u2014\nFig.35-43\nQ-2001\tMetronome\t-\t-\t-\t-\nQp2002\tMetronome,\tElectric Contacts -\t-\t-\nFig.137\n0,-2003\tstop Clock\t-\t-\nFig.l4l\n0,-2101 Electrically\tMaintained\tTuning\tFork\t50 D.V.\t-\t-\nOr-2102 Electrically\tMaintained\tTuning\tFork\t100 D.V.\t-\t-\n0,-2103\tStop Watch\t-\t-\nFig.l47\tTenth Second, Double Action Tines. A high grade stop\nwatch registering l/lO of seconds fitted with a 15 jewel chronograph movement. The split second hands make two revolutions per minute. Minute indicator registers half minutes and minutes up to 15 minutes. Start, stop and fly-back by consecutive depressions of the pin in the crown, (ilickel ca^se, 15 jewels)\nQg2104 Pastor Stop Watch\t\u2014\t-\t-\nFig.l4S Wicked finish. Unbreakable.crystal. Sweep hand starts, stops, flies back.under control of side pin. Shows seconds and fifths of seconds. Stop attachment independent of watch movement0\n0,-2105 Stop Watch.\t-\t-\t-\nFig.150 A plain stopwatch indicating l/lOs of seconds. The long hand travels once around the dial in 30 seconds. The snail hand registers up to 15 minutes. The case is made of nickel and chrome finished to. retain its bright color. Start, stop and return to zero by successive depressions of the crown,\n7 jewel lever movement\u00bb\n$ 192.00,\n$ 131.00,\n$ 153.00.\n$ I55.OO,\n$ 177.00.\n$ 25.OO..\n>p 47,00\u00bb\n$\t13.00.\n$ 10.00.\n$ 6.00,\n$\t35.00.\n$ 45.00.\n$ 30.00,\n$ 25.00,\n$ 60,00.\n$ 10.00.\n$ 15.0c.","page":66},{"file":"p0067.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig.143\nFig. 146","page":67},{"file":"p0068.txt","language":"en","ocr_en":"$ i4.oo\nQt-2106 Pig.153\n0,-2107\n0-2108\nStop Watch.\t-\t-\t-\nA plain stopwatch indicating l/5s of seconds, -he long hand travels once around the dial in 60 seconds. The snail hand registers up to JO ninutes. The case is made of nickel and chrone finished to retain its bright color. Start, stop and return to zero by successive depressions of the crown.\n7 jewel lever novenent.\nl/lOO Second Stop. Watch.\t-\t$ 35*00*\nThe large hand nakes one conplete revolution in 3 seconds, and registers the l/l00th pant of a second. The snail hand indicates up to 2 ninutes. ITickel case, 11 jewels.\n1/50 and 1/100 of a Second Stop Wptch,. The\u201chost accurate stop watches of this\ntype,\nPitted with\nhigh grade 15 and 17 jewel novenents respectively. The large hand nakes one conplete revolution in 6 seconds. The snail hand indicates up to 3 ninutes.\nl/50 of a second, 15 jewel\t-\t\u2014\t$ 75*00.\nl/lOO of a second, 17 jewels\t-\t-\t$100.00.\nQ,~3002 Tunable Marker.\t-\t-\t-\t$ 32.00.\nPig.35-40 This device is offered through the courtesy of Harold Schlosberg, Brown University. Por discussion sec the Journal of General Psychology, 1932, pages 483-485, fron which the following description is quoted:\n\"A tuned tine marker that operate s' on _60-cy\u00e7le A.C., and gives a smooth sigmoid curve of 120 cycles per second. The marker is simple, easily adjusted, accurate, quiet, and is durable and powerful enough to be used regularly by untrained students. The vibrating element is a 5\u201cinch piece of pian? wire held rigidly at one end, and fitted with a light celluloid tip at the other. The wire is tuned with an adjustable bridge, and the vibrations maintained by a small coil near the free end.\n\"Por use at 120 cycles, the wire should project about inches beyond the bridge. If regulated alternating current is not available, the marker nay be operated through a 100-cycle electrically maintained fork. This will not be as accurate as regulated A. C. If a slower vibration is desired, the length of the vibrating wire nay be doubled. The marker can then be operated through a rectifier at 60 cycles. The pressure exerted on the drun by the marker is not important, but the amplitude of vibration must be kept down to l/4 inch, to prevent \"chattering.\" If properly adjusted, the marker makes a barely audible hum when held firmly in a clamp., This may be practically eliminated by slipping a piece of rubber between the clamp and marker. It will then give a reliable tine line, with freedom from distracting noise, for as long a period as desired, without further attention.\"\nQ^3003 Electromagnetic Marker.\t-\nPig\u00ab35\u201c4l This is a new design. It has the following characteristics: the moving element is hinged at base, and the spring element against which magnet acts is a small coil spring with adjustable tension; the excursion of the narking point is controlled by means of the screw. It is compact, dependable and inexpensive.\n$ 8.50,","page":68},{"file":"p0069.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nPig. 148\nFig. 155\nFig. 149\nFig. 152","page":69},{"file":"p0070.txt","language":"en","ocr_en":"Q~300^ Triple Electromagnetic Marker\u00bb\t-\t~\t$ 21.00.\nEig.35-42 This unit is so constructed, on the principle of 35~^1\u00bb that the three points occupy a space of only three-fourths of an inch\u00bb\n\u00a3\u00a3-3005 Seconds Marker,,\t-\t\u2014\t~\t$ 30.00.\nEig.35-43\tThis unit is constructed on a small synchronous motor,\nEig.35-44 with contacts so arranged, that, when used with the two-7/ay marker shown in the cut, the record is made in one second, five\u2014seconds, and one minute intervals. A sample of such a record is shown in Figure 35044\u00bb The blank space at the position of a five-second mark indicates the end of a one-ninute interval.\nQ-3IO2 Jointed Tambour Marker. -\t-\t~\t$ 15.00.\nEig.35-45\tThis device is offered through the courtesy of Robert G.\nEig.35-46 Krueger, Yale Institute of Hunan Relations. It is\ndescribed in The American Journal of Psychology, April 1930\u00ab\nThe cuts, Figures 45-46, are here used through the permission of this Journal. The following quotation makes clear the purpose of this form of Tambour Stylus:\n\"The stylus of the ordinary tambour is frequently unsatisfactory because of the sloping arc in the tracing which is difficult to measure with exactness, especially where the excursion is large. To eliminate the arc the following design is proposed.\n\"Instead of placing the tambour with its stylus tangent to the kynographic drum, in the usual manner, the stylus is moulted at a right angle to the tangent. It consists of two sections,\nA and B, joined together by means of a hinge. At the end of section A, a small U-shaped piece of stiff paper (S) is attached with cement. The floating glass section (B) is S cm. long and |r cm. in diameter. One end of section 3 terminates in an a.rc of 7 nn* radius; the other is bent to form a right angle. The short leg of the angle is inserted in the vertical sides of the paper forming a hinge. A drop of cement 011 the free end at (C) holds section B in place. The holes in the paper should be just large enough to permit the glass tracer to swing freely when hanging down; if the holes are too large there will be a lateral vibratory movement. The glass section is allowed to ride against the drum, its own weight being sufficient to make the tracing.\" A typical tracing secured in this v/ay is shown in Eig.35~46.\nQr-4001 Three Unit Electro-Magnetic Counter.\t-\t-\t$ IB.00.\nFig.35**47\tThis cut show's the counter equipment as referred to in the\ndescription of attention test, P-5001. These counters nay be had singly or in any size units. They are simple, dependable and positive. A ratchet counter is operated by double armature controlled in rotary notion by a pair of small magnets. The action is simple, positive, and dependable.\n0,-4002 Electric Counter.\t-\t-\t-\t$\t30\u00ab00.\nFig.157\tCan be furnished for D.C., any voltage from 6 to 220\nor for A.C. ^,110 or 220 volts, 60 cycle.\nQ-4003 Electric Counter. Clock Face Type - High Speed\t-\t$\t27\u00ab00.","page":70},{"file":"p0071.txt","language":"en","ocr_en":"MARIETTA APPARATUS COMPANY, MARIETTA, OHIO\nPSYCHOLOGICAL EQUIPMENT\nFIG. 35-45\nFIG. 35-48","page":71},{"file":"p0072.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig.159\nFig. 169","page":72},{"file":"p0073.txt","language":"en","ocr_en":"Qr4i01\nQ-4012\nI\u2019ig.173\nQr500l\nFig.l49\nFis\u00b0151\nEig.152\nCounters.\nCounters should \"be specified according to the iollov/iiig table of characteristics!\nA. Type 1 - Sinple Counter\t\u201c\t\u201c\n2 - Reset Counter\t-\t~\nDouble Counter a) Total at top\n4\nB. Counting Method\u00bb\nC. Style of Case -\nreset at bottom b) Total\tat\tbottom, reset at top\nSpecial\t(a)\tStar Wheel\t-\t~\nHand Tally\t-\t\u201c\nSpeed Counter,\twith clutch\t\u2014\nSpeed Counter,\twithout\tclutch -\nOne revolution counts one. One-tenth revolution counts one Ratchet; counts one for each oscillation of shaft through 40 to 45 degrees. Has stops and return springe\nStar Wheel; counts one for each one-fifth revolution.\nFlange at Window.\nFlange at Base 3\u00b0 Gib Ca.se 4. Lug at Side 1. on left\n(b)\n(c)\n(d)\n1.\n2.\n3-\n4.\n1.\n2.\nD.\tShaft Position \u2014\n2. on right\nE.\tRotation Direction \u2014 1. Top of Shaft\n2. Top of Shaft\nF.\tRecord -\t1. Three figures\n2.\tFour figures\n3.\tFive figures (standard)\nturns toward observer turns from observer\n$ 3.00. $ 7.00. $ 4.50.\n$ 3.00, $ 5.OO, $ 4.50. $ 3.50.\nTo illustrate above specifications!\nFigure Figure Figure Figure Figure Figure Figure Figure Figure Figure\n155 represents A 3 (b), B 1 (or 2), C 3\u00bb D 1, E 1 (or 2) F 3 I5S represents\tA\t2 and 4 (b), 3\t3i ?\t2\n159 represents\tA\t1,\t3\t1 (or 2),\tC 3>\tD\t1,\tE\t1\t(or\t2),\tF\t3\nl6l represents\tA\t1,\tB\t1 (or 2),\tC 2,\tD\t1,\tE\t1\t(or\t2) F 3\nlb2 represents\tA\t1,\t3\t3> C 2, D\t2, D\t1,\tE\t1\t(or 2), F\t3\nl66 represents A 3 (b), B 1 (or 2), C 2, D 1, E\nB 1 (or 2),\nB 1 (or 2),\nB 4, C 2, D B 1, D 1, E\n167 represents A 3 (a)> loS represents A 3 (a), 169 represents A4 (a), 172 represents A 4 (d),\n1 (or 2),\nC 2, D 1, E 1 (or 2),\nC 4, D 1, E l(or 2), F 1, E 1, F 3\n1, ? 5.\nStop Watch Tachometer.\n$ 27.00.\nElectric Motor, Universal Laboratory Type (Bodine)\t\u2014\t$\t27.00\u00ab\nThe Bodine University Laboratory Kotor is a compact, variable speed power unit for use in lecture demonstrations.\nThis portable unit weighs approximately 3 lbs., has a maximum height of 9 inches and is supported on a cast iron base which also contains the rheostat for varying the motor speed. The entire unit is finished in baked enamel with nickel-plated trimmings, and is provided with a 5-foot attachment cord and plug.\nThe motor is furnished with a 5/l6-inch shaft. A \u25a0\u00a3\u2014inch shaft extension is provided at each end of the motor for a","page":73},{"file":"p0074.txt","language":"en","ocr_en":"Qr5lOl\nQr-5111\nPig.163\nQr5122\nFig.160\nPig.l64\nQr-6llO\nPig.170\nQ-6111\nPig.171\nQr\u00f6ll3\nFig.175\nsingle groove pulley or other shaft driven devices. The motor is supported on a detachable swivel stud that has two sockets, one vertical, and one horizontal. This offers a very simple and easy neons of setting the motor at any angle or height as shown in the various illustrations in this bulletin. The extreme flexibility of the motor mounting adapts the unit perfectly to the miscellaneous requirements of lecture table and laboratory work.\nThe speed adjustment by means of the rheostat in the base, is from standstill up to 10,000 E. P. M. without load and up to 6,000 E. P. Mo under full load.\nThe motor is a universal motor, being so wound that it will operate equally well from any 100-volt direct current circuit or from any alternating current circuit up to 60 cycles. The motor is rated at approximately 1/30 h.p., acid may be operated from any lighting circuit.\nAmmeters and Voltmeters.\nAmmeter and Voltmeter combined: 35 amps 10 volts\t-\t$\t1.75\u00bb\nAmmeter 0-30 amperes\t-\t-\t$\t1.50.\nVoltmeter 0-10 volts\t-\t-\t$\t1.25\u00bb\nMilliammeter 0-5000 milliamp\u00e8res\t-\t$12.00.\nShort Circuiting Key\t-\t-\t$\t13*00\nKnife Switches, porcelain bn.se, 15 amp.\nSingle pole, single throw - - $ \u00bb50. Single pole, double throw - - $ .60. Double pole, single throw - - $ \u00ab70. Double pole, double throw - - $ .30.\nG-al vanone t c r o \u2014 - $45.00.\nThis galvanometer is of the suspended moving coil reflecting type, complete with telescope and scale. The sensitivity expressed in terms of current applied to the terminals which will produce a deflection of one millinotor at a scale distance of one meter is 0.0l4 micro-anDere.\nSesistaiice Box.\t\u2014\t-\t$45.00.\nThis box has ton coil decades adjusted to l/lOa high-grade instrument designed to meet the demand for dial resistances at a moderate cost. This four dial resistance box 10 (0.1\t1\t10\t100).\nWheatstone Bridge Eheostat. -\t-\t$ 60.00.\nThis rheostat has 4 decades 10 (l 10\t100 lOOO)\nand a single dial control for Eadio arms. There arc 7 multipliers, 0.001, 0.01, 0.1, 1, 10, 100, and 1000.\nAdjusted to 1/20$ in bridge arms and 1/10$ in Eheostat.\nEheo stats\n6\tohms\t7.3\tamps\t~\t$6.00\t100\tohms\t2 amps\tA $\t6.00,\n12\tohms\t5.6\tamp s\t-\t$6.00\t190\tohms\t1.7 amps\tA\t6.00\n20\tohms\t4.2\tamps\t-\t$6.00\t600\tohms\t1.5 amps\t$\t6.00\n50\tohms\t3-3\tamps\t-\t$6.00\t2200\tohms\t.2 amps\t$\t6.00\n70\tohms\t2.5\tamps\t-\t$6.00\t\t\t\t\t\nQ-62OI Pig. 176","page":74},{"file":"p0075.txt","language":"en","ocr_en":"THE MARIETTA APPARATUS COMPANY\nMarietta, Ohio\nFig.171\nFig. 174\nFig. 175\nFig. 173\nFig. 176","page":75},{"file":"p0076.txt","language":"en","ocr_en":"Q-6202 Connutators.\t^\nPig.165\tKnife Switch Connut at or\t-\t~\t$ 1.25\u00bb\nPohl Commutator\t-\t-\t$ 4.50\u00ab\nQg6203 Telegraph Key 0,-6204 Telegraph Sounder 0,-6205 Photoelectric Cell\n$ 2.75\u00bb $ 3*oo* $10.00,\n0\u201c6206 Transformers, 110 volts Step Down\t-\t-\t$ 5\u00bb00*\nSecondary voltages 2|- to 25 in 2-|- volt steps.\n0-6207 Transformers, Step Up\nSecondary Voltage\t3>500\t-\t-\t$10,00,\nSecondary Voltage\t5\u00bb000\t\u2014\t\u2014\t$11.00.\nSecondary Voltage\t10,000\t-\t-\t$15*00,\nQ-6208 Mercury Switch.\t-\t-\t$ 7\u00bb50*\n0^9001 Tripod Bases\n1.\tLength of leg, 9cn \u2014 takes 10 rm rod -\nWith leveling screws\t-\n2.\tLength of leg, lien - takes 10mm rod -\nWith leveling screws\t-\n3.\tLength of leg, 13.5cn - takes 13rm rod -\nWith leveling screws\t-\n4.\tLength of leg, 15\u00bbSen - takes 13nn rod -\n5\n6\n7\ns\nWith leveling screws\t-\n.\tLength\tof leg, 15.8cn - takes 19 nn rod\t-\nWith\tleveling screws\t-\no\tLength\tof leg, 20cn - takes\t19 nn rod\t-\nWith\tleveling screws\t-\n.\tLength\tof leg, 22cn - takes\t30nn rod\t-\nWith\tleveling screws\t-\n.\tLength\tof leg; 40cn - takes\t30nn rod\t-\nWith\tleveling screws\t-\nSUPPORT RODS\no fit Bases 1 and 2 \u2014 Length \u2014 lOcn\nEach \u2014\t.35\n20 cm.\n.45\n$ .65. $ 1.95\u00bb $ .95. $ 2.20. $ 1.10. $ 2.45. $ 1.55.\n$ 2.SO.\n$ I.65. $ 3.05. $ 2.65. $ 3.4o, $ 4o4o, $ 6,50, $10.00. $12.00.\n30 cn\t40cn\n.50\t.65\nTo fit 3ases 3 and 4 -To fit 3n,ses 5 and 6 -To fit 3ases 7 and S -\n- Length\u2014 20cn 40cn Each- .65. .SO\nLength- 30cn* 40cn Each- .85\t1.05\nLength- SOcn lO\u00d6cn\nEach - 3*75 4.25\n60cn SOcn lOOcn 125cn\n.95 1.10\t1.45\t2.05\n60cn SOcn lOOcn 125cn 1.30 1.50 1.70 2.10\n120cn l60cn\n5.10\t5.85.","page":76}],"identifier":"lit13724","issued":"1930","language":"en","title":"Marietta Apparatus Company: Psychological Equipment, Marietta, Ohio, II","type":"Trade Catalogue"},"revision":0,"updated":"2022-01-31T12:47:25.541086+00:00"}