Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 201
air for thepassage of the current, so that the elec-trodes may be drawn apart to a distancewhich may be as much as 2]/z inches. Theselamps require free ventilation, so that theymust be open. Their economy is extraor-dinary, a candle-power being afforded for•353 watt, as against 1.78 watts for an… … Tungsten lamp ofDr. Hans Kuzel. HEWITT LAMP 161 necessary, and this fact joined to the high cost of the carbonslessens the net gain in their use. On another line of experimentnoteworthy results have been reached with metallic oxides.Magnetite, an oxide of iron, has developed a candle-power withbut…
Inventions · Inventors
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