Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 126
illumination was measured was not sosufficiently representative of the wholeroom as it might have been. As a resulta new system of lines L, M, N, and P,were marked out (Fig. 3), and it wasconsidered that measurements along these … 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…
Lighting
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