On colour-sight and colour-blindness : in its relation to railway and sea signals : read before the Glasgow Philosophical Society, on March 5, 1879 (1879)
Wolfe, J. R. (John Reisberg), 1824-1904, Royal College of Physicians of Edinburgh · London : J. & A. Churchill · leaf 14
12 are at present able to give of chromatic perception, yet, as microscopic anatomy has never demonstrated Fig 3 … Note. — This figure of Helmholtz explains his theory : — i expresses the • different degrees of excitation of red ; 2, that of green ; 3, that of violet. The vertical lines indicate the relation of the different coloured rays to the three nervous elements. The red, green, and violet rays (ought to)…
Color Vision Defects · Color Perception
Internet Archive · Royal College of Physicians in Edinburgh · Public domain (published before 1931). Free to use for anything.
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