Theory of colours and vision. / By G. Palmer.

  • Palmer, G. (Physicist)
Date:
MDCCLXXVII. [1777]
Catalogue details

Licence: Public Domain Mark

Credit: Theory of colours and vision. / By G. Palmer. Source: Wellcome Collection.

    32/48 (page 30)
    [ 3° ] APPLICATION. If the coloured ray fhould be the proper ray of the colour which appears, the intenfe- nefs of this colour would increafe with its own ; and the focus would be exceffi vely co¬ loured, as being a ftrong re-union of the co¬ loured points. But, as the colour of this ray is feen by its abfence, and by the repofe of the analogous particles of the retina, it is certain, that, although I increafe the intenfenefs of the ray which appears by being deficient, I do not thereby render it more deficient; nor can I lee its colour ftronger. Befides, when thefe rays have, by their in¬ tenfenefs, acquired a great degree of ftrength, they move the particles analogous to the abfent ray, (as I faid in the 6th Principle on Vifion,) and deftroy apart of their repofe in a manner very tirefome to the eye; for it bears rather a white focus of the fame denfity, aB though ftronger than many of the before^ mentioned ones. experiment XVII, I V I dye a piece of white woollen cloth, of a deep blue, with indigo. EXPE.