Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 141
irections, then thepreceding figures would represent theproportional photometric values of thelight included in the respective angles.They do not, of course, represent theutihty values of the Hght, but they doindicate the amount of raw materialavailable for use by the application ofappropriate… … «- — 24 1 Fig. i.—Distribution curve of incandescentmantle and mantle in enamelled steel reflector. b}?^ the adoption of suitable reflectors ismore than compensated for by theimproved illumination. Nature of Shades Available. For our purposes any element usedin conjunction Avith a source to…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
