Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 476
Fig. 7.—The light in this case is wastedand hadly distributed. Fig. 8.—The reader here throws his ownshadow on the paper. 470 THE ILLUMINATING ENGINEER (nov.)
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
