Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 143
80 Bare mantle100 Fig.mantle … 6.—Distribution curve of incandescent and mantle in white opal glass. Fig. S.—Distribution curve of incandescent mantle and mantle in cardboard shade. of shades, we have reproduced inFigs. 3-20, a series of diagrams, eachcomprising the polar curve of hghtdistribution from the bare source andthe…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
