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 489
Figs. 3,630 to 3,633.—Con-struction details of West-inghouse auxiliary con-tactor equipment. Fig. 3.630, tripping switch; fig. 3.631, pneumatically op-erated line switch; fig. 3.632, electrically oper-ated contactor in iron box;fig. 3,633, auxiliary con-tact attachment for typeK:28 controller. The…
Electrical engineering
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