Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 218
howing the considerable amount of c xtrawork involved in prodiicing metal reflec-tors with special contours. One canunderstand that the manufactiue ofordinary conical shades is a mucli simplcumatter. But the extra labour involvedis compensated by the greater utility ofproperly designed reflectors… … Fig. 1.—Spinning special rcllectors for lightingmunition works.
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
