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 214
spar which divides ordinary lightup into two beams of equal intensity. In this latter casewe arrange a disk by making half of its surface white, theother half black, as represented in Fig. 89 ; alongside of it,on a black ground, we place a strip of the same white pa-per ; the disk is then set in…
Color · Painting · Color in art
Internet Archive · Getty Research Institute · Public Domain Mark 1.0. Free to use for anything.
