Color-vision and color blindness, a practical manual for railroad surgeons (1920)
Jennings, John Ellis · Philadelphia F.A. Davis · leaf 38
FlG. 9.—DiAGRASI ILLUSTRATING THE RECOMPOSITION OF WHITE LIGHT. duced by combining the colored rays. If the spectrumbe allowed to fall upon a double-convex lens (Fig. 9),the rays are re-united to form a pencil of white light onthe screen F^ placed at the focus of the lens. That white light can be… … FiG. 10.—Newtons Disc. tion of the spectral colors can be demonstrated by meansof Newtons disc. This consists of a card-board discabout one foot in diameter, upon which is pasted stripsof colored paper to represent five spectra; the centreis covered with black paper. (See Fig. 10.) When thedisc is…
Color-blindness · Eye
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