Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 122
ively long exposure is allowed.This is partly due to the lower actinicpower of artificial light as comparedwith daylight, and partly to the factthat the brightness of daylight is, asa rule, incomparably greater. Some examples of such photogra])hstaken by electric light are given al)ove.The… … Co?y illiniiination from a hnnked-uii
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