Luckiesh, Matthew, 1883-1967 · New York, D. Van Nostrand company · leaf 157
in monochromatic lights of different wave- lengths, but gives no data on the relative brightnesses of the colored lights. A serious defect in most of the above work is the fact that the lights were neither monochromatic nor did their spectra extend over equal ranges of wave-lengths. The same… … Fig. 68. — Apparatus for determining visual acuity in monochromatic lights. nesses, the author 22 devised the apparatus shown diagrammatically in Fig. 68. The lines of the acuity object,15 c, having a highly illuminated ground glass background, d, were focused crosswise on the slit of a Hilger…
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