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 42
armature is held up by the magnet. THE TELEPHONE 2,135 The wiring of one elementary type of branch parallel switchboardis shown in fig. 2,941. The diagram shows the connections of onlyone line in the three sections of the switchboard. The Common Battery Telephone System.—This issometimes called a… … TRUNKJACK JP lr DROP1SHUTTER V
Electrical engineering
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