Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 541
ique sign for tlie Lancashire & Yorkshire angles much more easily. Beads Railway, such as are being used out- of various sizes can be used. This side many of the underground railway is necessary in order to follow a stations in London. pattern or figure exactly, and it is The essential… … FlG. 3.-The well-known Dead Si-ii at tin.- (...lii-euiu, Lumlon. iKuiiiiiuitf.l Il rl inil Ijv aiclauip? that this spherical shape is essentialin order to secure uniform brightnessof the beads from whatever directionthey are observed. It it also statedthat the fact of the bead pro-jecting from the…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
