Researches in colour vision [electronic resource] : and the trichromatic theory (1913)
Abney, William de Wiveleslie, Sir, 1843-1920, Parsons, John Herbert, Sir, 1868-1957, donor, Institute of Ophthalmology, University College, London. Library Services · London : Longmans, Green and Co. · leaf 207
EXTINCTION OF COLOUR AND LIGHT 187 The intensities of the light in this table have to be multiplied by 7*7 to compare it with the extinction with the centre of the eye shown in Table XVII. , where the scale is in millionths, and the D light is equal to 1 candle. It will be noticed that at SSN. 60… … Fig. 64. with an intensity 2*6 times greater than when the illumination is '00078 candle, and that the ratio of the maximum extinctions are for those illuminations as 9*8 to 309, or as I to 32. The observation recorded on p. L48 as to the reappearance of the red when ex- tinguishing its colour is…
Ophthalmology · Eye · Color vision · Color Perception
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