Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 49
ve shown that the enclosed arc wasfour times as powerful as the open experiments on the relative photographicefficiency of all the illuminants at presentin use in kinema studios. I recently showed a gentleman whoseinterest had been aroused a series ofphotographs taken by artificial light.They were… … Pig. 3.—Photograph of the Author taken ata distance of 4 feet from one bank ofmercury lamps. type arc, using ordinary carbons ; andthat the enclosed arc gives at least twiceas much photographic light as themultiple open type lamp, the latter usingwhite flame carbons. As regards thephotographic…
Lighting
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