Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 405
etallic filamentor Xernst lamp of 50-100 H.K. givesthe best result. The measurements can be carriedout on an ordinary photometric bench,but it is necessary to place the lamptested at a convenient distance fromthe photometer, and only move thecomparison lamp. When using theseobscuring glasses, it is… … Fig. 2.—Universal Photometer. COLOUR IN ARTIFICIAL ILLUMINANTS. 377 Xernst lamp at a distance of 5-8cm. issubstituted in front of the milky glassscreen, the other screen being illu-minated by the lamp to be tested. Theadjustment of the light is carried outby means of the sector ;S, and theimage of…
Lighting
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