Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 70
hori-zontal plane alone was not a sufficientindication of the value of an installation.Generally speaking, vertical illuminationwas equally important. Some of the speakers appeared to inferthat the replacement of local lights bygeneral illumination was something newand untried. This, however, was… … Fig. 1.—Diffusion—Similar lamps equipped with similar types of reflectors. Thaton right polished surface, that on left dcpolished surface. Note softening ofshadows from depolished surface.
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
