Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 146
Fig. 12a.—Distribution curve of bare tungstenlamp (1) and same lamp iu enamelled ironreflector (2). 210 220 200 180 160 140 120 100 80 60 … Fio. 12.—Distribution curve of incandescentmantle and same mantle with various Holophanereflectors. particles {e.g., frosted and opal glass)on transmitted light have in generallittle directive effect. Dense globes ofthis type tend to give a more or lessspherical polar curve, flattening…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
