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 46
Fig. 9.—Eye-piece with Daltoifs Scalo. For the determination of the hue, an ordinary one-prismspectroscope can be used ; it is only necessary to add a littlecontrivance which enables the observer to isolate at will any THE CONSTANTS OF COLOUR. 37 small portion of the spectrum. This object is easily… … Fig. 10. — Rutherfurds 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 viewthe selected spectral colour ; in the lower part of the fieldthe scale is visible, and with its aid the precise position ofthe…
Color · Painting · Color in art
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