Apparatus for appreciation of color. After Galton, by Cambr. Scient. Instr. Co.
Source
Anonymous. 1892. Harvard Psychological Laboratory in Dane Hall: Instruments for Experiments on Sight. Photograph. (Harvard University Archives - HUPSF Psychological Laboratories (7))
The “Apparatus for the Appreciation of Colors”, is a different instrument from Holmgren's Worsteds although it is based on the same idea. See another description in the 1889 catalog of the Cambridge Scientific Instruments Company (No. 387).