Modern chromatics, with applications to art and industry (1879)
Rood, Ogden N. (Ogden Nicholas), 1831-1902 · New York, D. Appleton and Company · leaf 43
THE CONSTANTS OF COLOUR. 37 small portion of the spectrum. This object is easily at- tained by introducing into the eye-piece of the instrument … Fig. 10.— Eutherfurd’s Automatic Spectroscope. a diaphragm perforated by a very narrow slit (see Fig. 9). The observer then sees in the upper part of the field of view the selected spectral colour ; in the lower part of the field the scale is visible, and with its aid the precise position of the…
Color · Painting · Color in art
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
