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 164
many times as the operator breaksand closes the circuit with the keys, just so many steps forwardor backward is the dial moved. Pulsating currents from thesekeys operate the relays and printing magnets of the distant THE TELEGRAPH 2,257 tickers with distinctly audible sound. When it is necessary… … Fig. 3,096.—Bunnell double pen ink writing register for Morse telegraph with lever for startingand stopping at will. called the Universal ticker and is the invention of Edison. Eithercan work at a speed of at least forty words per minute. Messenger Gall Service.—In former years, when any onewished…
Electrical engineering
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