Abstract
Mr. R. G. Horner and Mr. E. T. Purslow have made a detailed study of the fact that the red-green ratio required to match a given yellow in the anomaloscope is dependent to a marked extent upon the distance of viewing (or the angular field). I observed this effect in my anomaloscope1, and one of my students made a study of it. He is now unfortunately inaccessible, being in the Navy, and I am unable to quote his measurements; but his findings were approximately those given by Horner and Purslow, namely, a rapid change in the ratio at small distances, settling down to a constant value where the distance is large, that is, the angular field sufficiently small.
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J. Sci. Instr. 22, 15 (1945).
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SHAXBY, J. [Letters to Editor]. Nature 160, 24 (1947). https://doi.org/10.1038/160024a0
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DOI: https://doi.org/10.1038/160024a0
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