Electricity for public schools and colleges (1891)
Larden, W. (Walter), b. 1855 or 6 · London : Longmans · leaf 461
ed the tough threadsthus obtained. In the figure is shown a S7Can lamp.It will be observed that, in order to give agreater amount of light within the same space, the filament isgiven a twist into one or more spirals. Near the ends thefilament is thicker ; this is to obviate any great heating… … CH. XXV. VARIOUS APILICATIONS OF ELECTRICITY 435 a good vacuum will act rather to strengthen the filament bydeposition of carbon than to weaken it by combustion. It is found that the carbon filament is slowly dispersed andotherwise weakened by continued u§e. Each lamp has, in fact, adefinite life…
Electricity
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
