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 214
ight. WIRELESS TELEGRAPHY 2,305 Ques. What should be done in operating the emergencyset? Ans. The switch connecting the direct current with thestorage battery must be thrown off. The strength of the storage battery is ascertained by pressing thebutton of the voltmeter. Before operation, a flexible… … Fig. 3,153.—Aerial or antennae switch used at Marconi stations. It differs from almostevery other kind of switch, and has two heavy copper blades and a small inner half-bladewhich are raised and lowered by an insulated handle. When thrown down, it is used forsending as it then breaks the antennae…
Electrical engineering
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