Ballard, William Cyrus, Jr · New York [etc.] McGraw-Hill company, inc. · leaf 43
barium, strontium and calciiun are particularly valuablein this respect and can be operated at a fairly low red heat ascompared to the brilliant white heat required for tungsten. 22 ELEMENTS OF RADIO TELEPHONY Since the power input to thQ filament is used very largely toproduce heat in the filament… … Fig. 8.—Receiving tube (left) and 5-watt transmitting tube (right). cfertain compounds of the three metals which change intothe oxides when heated. The author has built a number ofliiibfeB using other materials in place of platinimi with veryg66d success. The saving in power for a given…
Radio
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