Two perimeters. After Landholt and Priestley Smith, by Meyrowitz, New York
Image source (VL Image)
Source
Anonymous.
1892.
Harvard Psychological Laboratory in Dane Hall: Instruments for Experiments on Sight.
Photography
Related VL Sites
Psychological Laboratory, Harvard University.
Cambridge (MA).
comment
See a color photograph of this device in the <link href='http://dssmhi1.fas.harvard.edu/emuseumdev/code/emuseum.asp?rawsearch=Number%2F%2C%2Fis%2F%2C%2FWJ0034%2F%2C%2F0%2F%2C%2F0'>Harvard Collection of Historical Scientific Instruments</link>. See figures of similar instruments in catalogs by <link ref="lit66" page="p0018" mk="0.2182/0.7588" >Waldek & Wagner, 1905, No. 210</link> and <link ref="lit61" page="p0080" mk="0.2846/0.26" >Katsch, 1906, No. 885</link>.VL Technology
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