Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 72
s any outer globe used. This economyin outer globes has also been practisedwith indoor gas burners where metalreflectors afford all the protection that isnecessary. Probably some slight reduc-tion in theoretical efficiency has resulted,but in dusty situations (and on a railwayis there any place…
Lighting
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