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 91
COLOUR VISION 76 Fig. 29 shows the fields with red .. 670-5 w 589-2 „ 0-21 foot-candle yellow 530 „ green blue . 460-3 , … Fig. 29. The fields of vision for spectral colours with low illumination ( D light = 0-21 foot- candle at the screen). (Abney.)
Color vision
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