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Abstract
Laboratory and classroom demonstrations of color vision usually require a number of separate pieces of equipment. The conventional colorwheels, colorimeters, color blindness test-plates, and combinations of projectors are cumbersome and are of limited effectiveness as demonstrations for large classes. The purpose of this note is to describe the construction of a relatively simple device that provides additive color of sufficient intensity to be used on a screen. It is a single portable instrument that demonstrates the principal facts of color vision. It may also be used as a group-test for the various forms of color blindness. It has been constructed from commercially available components.*
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