Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 451
inverted incan-descent gas. The incandescent mantle is just FiG. .5—Good metlioJ of lighting compositorsvisible to a man of average height; the angle of frames by high pressure inverted incandescentglare is 40° at the lower, and 10° at the upper g^g. The eye is completely protected from theedge of…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
