Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 126
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). … Fig. 22.—Polar curve of 230 v. 200 w. gas-tilled lamp in conjunction with IndirectSilvered Reflector shown in Fig. 4h (lampfilament 1 in. below plane of rim of bowl). Note on the Change in the Selection of theLines along which the Illuminationwas Measured. After Installation III. had been…
Lighting
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