Apparatus for testing the appreciation of difference in musical pitch. After Galton, by Camb. Scient. lnstr. Co. See a figure of this device in the <link href="http://www.sil.si.edu/digitalcollections/trade-literature/scientific-instruments/files/51682/imagepages/image117.htm">1899 catalog</link> of the Cambridge Scientific Instruments Co, p.109, no. 392. Apparatus for testing the appreciation of difference in musical pitch. After Galton, by Camb. Scient. lnstr. Co.

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This device seems to be M51, see (Cambr. Scient. Instr. Comp. Catalogue1899, item No. 392):   http://www.sil.si.edu/digitalcollections/trade-literature/scientific-instruments/files/51682/imagepages/image117.htm 
Rand: Please confirm. 
Comment Rand Evans II: Yes, this is Galton’s Apparatus for testing the apprciation of difference in musical Pitch.  M51.  The illustration below is from Cambridge Scientific Instruments 
Catalogue of 1899 [Related img30381, similar to link above ] 
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  <dc:subject>technology</dc:subject>
  <dc:title> Apparatus for testing the appreciation of difference in musical pitch. After Galton, by Camb. Scient. lnstr. Co.   See a figure of this device in the &lt;link href="http://www.sil.si.edu/digitalcollections/trade-literature/scientific-instruments/files/51682/imagepages/image117.htm"&gt;1899 catalog&lt;/link&gt; of the Cambridge Scientific Instruments Co, p.109, no. 392.  Apparatus for testing the appreciation of difference in musical pitch. After Galton, by Camb. Scient. lnstr. Co. </dc:title>
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