Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 126
Fig. 19.—Polar curve of 230 v. 200 w. gas- Fig.filled lamp in conjunction with Semi-indirect 14 in. Opal Bowl and Over Reflectorshown in Fig. 4e (lamp filament 2| in.below plane of top of bowl). 20.—Polar curve of 230 v. 150 w. gasfilledlamp in conjunction with Semi-indirect 7 in.Opal Bowl shown in… … Fig. 21.—Polar curve of 230 v. 150 w. gas-filled lamp in conjunction with Semi-indirect 11 in. Opal Bowl and 23 in. OverReflector shown in Fig. 4g (lamp filamentin plane of rim of bowl).
Lighting
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