Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 125
Fig. 17.—Polar curve of 230 v. 150 w. gasfilledlamp in conjunction with Semi-indirect14 in. thick Translucent Bowl shown 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.…
Lighting
Internet Archive · University of Toronto Libraries · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-221-129.webp)
