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ART. 345 - On Colour Vision at the ends of the Spectrum

Published online by Cambridge University Press:  05 December 2011

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Summary

It is half a century since Maxwell investigated the chromatic relations of the spectral colours and exhibited the results on Newton's diagram. The curve “forms two sides of a triangle with doubtful fragments of the third side. Now, if three colours in Newton's diagram lie in a straight line, the middle one is a compound of the two others. Hence all the colours of the spectrum may be compounded of those which lie at the angles of this triangle. These correspond to the following—scarlet, wave-length (in Fraunhofer's measure), 2328; green, wave-length, 1914; blue, wave-length, 1717. All the other colours of the spectrum may be produced by combinations of these; and since all natural colours are compounded of the colours of the spectrum, they may be compounded of these three primary colours. I [Maxwell] have strong reason to believe that these are the three primary colours corresponding to three modes of sensation in the organ of vision, on which the whole system of colour, as seen by the normal eye, depends.”

Later observations, such as those of König and Dieterici, have in the main confirmed Maxwell's conclusions. The green corner is indeed more rounded off than he supposed. It is with regard to the “doubtful fragments of the third side” that I have something to say.

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Scientific Papers , pp. 569 - 572
Publisher: Cambridge University Press
Print publication year: 2009
First published in: 1912

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