Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 74
andalso for advertising work—for the floodlighting of buildings and of hoardingsat night. The filaments of these lampsare made in a concentrated form of spiral,and they are replacing, in a large measure,searchlight arcs in sizes below 10 to 20amperes. Certainly very much betterresults had been…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
