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 Surgeons of England · London : J. & A. Churchill · leaf 16
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)…
Transportation · Color Vision Defects
Internet Archive · Royal College of Surgeons of England · Public domain (published before 1931). Free to use for anything.
