Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 44
-. … Fk}. 1(5.— Plan of elevation sliowing arraiigeniont of filtinss in Congress Hotel.Four 250 watt-lauips per point. {ViA l><.) Difficidty of Keeping the FittingsClean.—The point has been made thatthe upturned fittings collect dust anddirt, which reduces the efficiency of thelight by settling on…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
