Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 56
iffuse the light. However, hethought that the presentation of un-screened filaments at the comparatively 4 -3 - Chancery Lane (enclosed arcs). At the Oval, where doublets of50 c.-p. tantalum lamps are employed(without reflectors) 40 ft. apart, theillumination was natiually considerablybelow the… … British Museum (Holophane Reflectors100-watt Tungsten lamps).
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
