An introduction to the study of colour vision (1915)
Parsons, John Herbert, Sir, 1868-1957 · Cambridge [Eng.] : University Press; New York, G.P. Putnam's Sons · leaf 78
SCOTOPIA OR TWILIGHT VISION 63 identical with the luminosity curve of a feeble spectrum when the maxima are made equal. Fig. 21 shows such a curve. Such are the conditions of the chromatic and general thresholds in the dark-adapted eye. What are the conditions of extinction of colour and light in… … 0 2 4- 6 8 10 12 W- 16 18 20 ?2 24 26 28 30 32 34- 36 38 40 42 4446 48- 50 52 54 56 58 60 62 64 66 Seal? of Spectrum Fig. 20. " Extinction of light " curve. Abscissae, wave-lengths of the prismatic spectrum ; ordinates, the fractions of the beams which are just invisible, the unreduced illumina-…
Color vision
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