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 239
ight. Theopening of the switch disconnects one side of the line from the controllerswitchboard, enabling the operator or janitor of the building to open trie-circuit to the motor without going to the main line switch. The serviceswitch controls, from one set of contact, the continuity of both the… … STOP MQTlON.SWjf&H EKTOA FIELDJMUNT FIELD Fig. 4,160.—Diagram of Otis style B, direct current, two speed magnet controller. Controllers in which the shunt field is always opened when the car switch is thrown to theoff position are sometimes called for. This requirement can be met by the…
Electrical engineering
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