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 82
Fig. 22. Extinction of light curves for different degrees of light adaptation. Abscis-sae, wave-lengths ; ordinates, logarithms of the intensities of the light. (Abney.) 100 … Fig. 23. Persistency of light curves corresponding to the extinction of lightcurves for different degrees of light adaptation. Abscissae, wave-lengths ; ordinates,reciprocals of extinction values. (Abney.) As the parafoveal illumination diminishes the curve shifts towards theviolet end, so that the…
Color vision
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