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 223
ellow operators before they sign. 2,314 HAWKINS ELECTRICITY The Marconi magnetic detector is shown in fig. 3,168. Thistoo, is fast being replaced either by crystal detectors or by theaudion. There are many natural or fused crystals in use in various types ofdetector stand. The oldest form is the… … Fig. 3,164.—Auxiliary induction coil. This is an open core transformer built in the shapeof a large Ruhmkoff coil with a heavy vibrator and contact screws. It is only used whenthere is no power available to run the motor generator. Its source of electrical supply isa storage battery which should…
Electrical engineering
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