Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 46
es in the use of transmission screensmay be appreciated by studying thecurves in Fig. 3 taken from a previouspaper* for two signal green glasses. Signal green is a most useful glassowing to its strong absorption of thelonger wave-lengths. Cobalt bluef trans-mits the violet more satisfactorily,… … 0* 05 n-fi °7m Wave length (visible). Fig. 3.—Spectral Distribution for two Signal Green Glasses (1) and (2). Mees has devised a screen for thecorrection of ordinary metal filamentlamps, consisting of a special glass,together with a gelatine screen. Ivesand Luckiesh have produced a similarscreen.…
Lighting
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