Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 542
y filament lamps or can carry trans-parent advertisements lighted frombehind. These have been experimented with ah-eady, but in most cases the J-^uy-Appiirat.o.i of bead s.gu to a tmmcar itlight has been obtained from storage batteries. A dvnamo run from the very popular with some of the bigengine…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
