Students' text-book of color, or, Modern chromatics : with applications to art and industry (1881)
Rood, Ogden N. (Ogden Nicholas), 1831-1902 · New York : D. Appleton · leaf 121
blackenedscreen of pasteboard is pierced with two narrow slits, ar-ranged like those in Fig. 41. The light from a window isallowed to shine through the two slits and to fall on a prismof glass placed just before the eye, and distant from theslits about a metre. Then, as would be expected, each slit… … Fig. 41.—Two Slits arranged for mixing Two Spectra. on the green space of its companion. By moving the slits fur-ther apart or nearer together, all the different kinds of lightwhich the spectrum contains may thus be mingled. Usinga more refined apparatus, Helmholtz proved that the unionof the pure…
Color · Painting · Color in art
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