Henry and Hora's modern electricity; a practical working encyclopedia (1915)
Henry, James. [from old catalog], Hora, Karel Jan, 1881- [from old catalog] joint author · Chicago, Laird & Lee, inc. · leaf 248
ELECTRICAL ENGINEERING 245 that of ordinary incandescent lamps, being from 0*5 to 0-25watt per c. p. As there is nothing in the lamp whichcould wear, the lamp theoretically is everlasting and showsafter a use of 2000 hours but slight decrease in efficiency.The mercury vapor lamp was invented by…
Electrical engineering
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