Colour : a text-book of modern chromatics with applications to art and industry (1904)
Rood, Ogden N. (Ogden Nicholas), 1831-1902 · London : Kegan Paul, Trench, Trübner · leaf 121
ne by Lambert and Helmholtz. This apparatus is shown in Fig. 39. The glass is supported in a vertical position about ten inches above a board painted black, and on either side of it are placed the coloured papers. The blue paper is seen directly through the glass, while the light from the yellow… … Fio. 40.— Result furnished by the Apparatus. ages can be varied at will ; for instance, moving the papers further apart causes the blue to predominate, and bringing them nearer together produces the reverse effect. In this manner the resultant tint may be made to run through a variety of changes,…
Color
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