An apparatus for quantitative measurements of color vision.

Abstract
An apparatus is described by means of which exact measurements of color vision can be made. It consists of a polarization spectrophotometer with a Brace prism, and a spectrometer with a Pellin Broca constant deviation prism. The subject matches the colors from these 2 sources by adjusting the spectrometer until the 2 hues are considered to be the same.

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