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 78
r% Signal BallWhen Operated i Position of Armature When Operated Generator Armature. \ W/////ffl Line ¥ ^. … VacA Fig. 2,986.—How the magneto system works: 2. Calling central. The subscribers firstact in signaling the operator before his receiver is removed from the switch hook is hereshown. The arrows indicate how the alternating current produced by the turning of thehand generator at the subscribers…
Electrical engineering
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