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
nsities of the light for different wave-lengths for extinction with different strengths of illumination of theparafoveal zone with white light. Fig. 23 shows the corresponding persistency curves. These, asbefore pointed out, give the luminosity curves of the spectrum at thepoints of extinction, and… … 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
Color vision
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