Colour-blindness and colour-perception / by F. W. Edridge-Green.

  • Fredrick William Edridge-Green
Date:
1891
Catalogue details

Licence: Public Domain Mark

Credit: Colour-blindness and colour-perception / by F. W. Edridge-Green. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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    COLOUE-BLINDNESS AND COLOUK-PEECEPTION. CHAPTEE 1. HISTORICAL. The first definite step towards an appreciation of th« science of colour was made by Newton, by his researches in optics and his demonstration of the compound character of the sun's light. Kepler was the first to discover the compound nature of solar light, but comparatively little attention was paid to his observations. The experiments of iSTewton attracted more notice, and his theories were accepted by the scientific men of his time. ^Tewton was of opinion that white light is made up of seven different colours: red, orange, yellow, green, blue, indigo and violet, each differing in refrangibility. Brewster was of opinion that there are three different colours in the spectrum—red, yellow, and blue. He believed that the simple spectrum is composed of three different spectra —red, yellow, and blue. Helmholtz pomted out, in a very able paper, the defects in Brewster's methods of experimenting, and, except with artists, this theory has been very generally rejected. B
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