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For the last five years, part of my duties has been the examination of the color sense of applicants for various government services. Williams' lantern and the color skeins have both been employed and are still used. However, I have felt that the color skeins have certain disadvantages; among them, the length of time involved in giving the test, the fact that the loose skeins are apt to be misplaced or lost and also the fact that they are apt to become soiled, thus further confusing the applicant.
About two and a half years ago, I devised a scheme that I think has all the advantages of the color skein system without most of the disadvantages. I have termed the test the "color wheel test," because of its construction. The device has compactness, being 15 inches square and about 2 inches high at its highest point. It also has permanency,
Nelson WG. A NEW DEVICE FOR TESTING THE COLOR SENSE. JAMA. 1925;85(16):1220–1221. doi:10.1001/jama.1925.26710160002010a
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