Johnson, George Lindsay, 1853- · London : G. Routledge · leaf 308
N COLOURS on the other hand results from the absence of all stimulation of those parts which are capable of responding to colour stimuli. Helmholtz constructed a scheme to illustrate the effect of stimulating the photo-chemical substances which produce the three colours in different degrees… … Fig. 30. — Scheme illustrating the Young-Helmholtz Theory of Colour Vision. The curves represent the intensity of stimulation of the three colour substances. little green and a mere trace of red. It will be noticed from the annexed figure (Fig. 30) that it is impossible to stimulate any one of the…
Color photography
Internet Archive · Gerstein - University of Toronto · Public domain (published before 1931). Free to use for anything.
![An illustration from Works. Popular edition.] 2 series (1886)](https://img.insideoutlibrary.com/img/200/bl-bl_003191336_5-318-1.webp)