Ballard, William Cyrus, Jr · New York [etc.] McGraw-Hill company, inc. · leaf 104
n and requires but two-tenths of an ampere tobring the filament up to normal brilliancy. The filament isof the coated type and consists of a very fine platinmn stripcoated with the oxides of certain of the alkaline metals andwiU consequently be ruined if operated above a red heat.The filament… … tube _J\socket
Radio
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