Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 379
e in cross section; a filament to carry 20amp. at 10 volts gives 2 candle-power per watt while a thinnerfilament to carry 5 amp. at 40 volts gives only 1.4 candle-powerper watt. The lamp at its best efficiency cannot be made atpresent for less than about 350 candle-power, in which size it…
Electrical engineering
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