Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 375
ral heateiS are not cleaned, but are renewed at the end ofthe useful life of the glower. The light given by these lamps isvery white in color, and the use of sand-blasted or alabaster globesreduces its intense brilliancy. 312 ELECTRIC LIGHTING 31 Osmium Lamps. Osmium has been experimented on as… … Fig. 25. and the difficulty of making a filament fine enough to give thedesired resistance for higher voltages. At 25 volts, lamps are con-structed giving an efiiciency of 1.5 to 1.7 watts per candle-power^and with a life comparable with that of a 3.5-watt incandescentlamp. The low voltage makes…
Architecture · Building · Carpentry
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