Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 121
the radio-miciometer ofBoys, in one case by a rotating sector,in the other by a diaphragm. Whenobserved by the eye, the former was(I per cent, less bright than the latter. Something similar was found by Bunsenand Roscoe in the action of light on amixture of hydrogen and chlorine. Aperiod of… … Fio. 3.—Electrical changes produced byj.iyht in the Retina (Einthoven string galvano-meter). White areas are periods of illumination, dark areas periods of darkness.(After Piper). Fourthly, the latent period shown intlie figure has its importance with respectto Talb tts law and the use of the…
Lighting
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