Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 241
formed. One electrode is carbon and the other is copper,and the arc works-best when burnt in the vapor produced by the flameof an alcohol torch. The high frequency currents produced pass through the primary ofthe transformer, a condenser being interposed in the circuit. Thesecondary of the… … Fig. 3,193.—Professional type of audion detector. It is provided with two super-sensitiveAudion Bulbs, high voltage local battery, potentiometer switch graduated to show voltageat any point, switch to change from one bulb to the other, and rheostat to change .bril-liancy of filament. This detector…
Electrical engineering
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