Apparatus for appreciation of color. After Galton, by Cambr. Scient. Instr. Co. 
        
           
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        The “Apparatus for the Appreciation of Colors”, is a different instrument from <link ref="tec2987">Holmgren's Worsteds</link> although it is based on the same idea.  See another description in  <link href="http://www.sil.si.edu/digitalcollections/trade-literature/scientific-instruments/files/51682/imagepages/image116.htm">the 1889 catalog</link> of the Cambridge Scientific Instruments Company (No. 387).