Cardboard and gelatine paper of various colors, two hundred sheets of colored paper, colored crayons, etc. By Milton Bradley Co., Springfield; Prang, Boston, etc.
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%2FWJ0619%2F%2C%2F0%2F%2C%2F0'>Harvard Collection of Historical Scientific Instruments</link>.VL Technology
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