Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 126
hown inFig. 4o (lamp filament 2 in. below planeof top of bowl). Fig. 18.—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. 4d (lamp filament2 in below plane of top of bowl). THE ELLTJMINATING ENGINEER (apbil 1922)… … 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
Lighting
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