Luckiesh, Matthew, 1883-1967 · New York, D. Van Nostrand company · leaf 30
COLOR AND ITS APPLICATIONS 10 sity. In Fig. 2, A represents the light sensation pro- duced in the author’s eye by equal amounts of energy of various wave-lengths as measured with a direct comparison or equality-of-brightness photometer. The photometric field was a circle whose diameter sub- … 0.40 0.44 048 052 0.56 060 064 0.68 Jl, WAVE LENGTH Fig. 2. — Showing the relation between radiant energy and light sensation. tended an angle of about four degrees at the eye, and whose brightness was equivalent to that of a white surface illuminated to an intensity of 20 meter candles ; (a meter…
Color
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