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 214
e forty-eighth of a second ; hence it is necessary for the disk to revolve forty-eight times in a sec- ond in order to produce the appearance of a steady, uniform ring of light. While, as just stated, the impression lasts with undiminished strength for one forty-eighth of a sec- ond, its total… … Fig. 87.— Disk with White Sector. Fig. 88.— Disk of Fig. 87 in Rapid Rotation. It is not, however, to be supposed that, in the experi- ment indicated in Fig. 88, the ring of white light will haye the same degree of luminosity as its source, viz., the slip of white paper pasted on the black disk ;…
Color
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