Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 143
ower lamps. Ill IS ELECTRIC LIGHTING The advantages of these metals, tantalum and tungsten, forincandescent lamps are in the improved efficiency of the lamps andthe good quality of the light, white or nearly white in both cases.In either case the change in candle-power with change in voltage isless…
Architecture · Building
Internet Archive · Kelly Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
