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 135
ion of the metal, which graduallyloses its resiliency. Snap switches sometimes fail through the weakeningof the springs which hold them in the on or off position. Thecontacts of a switch should be kept in good condition. Primary Connections.—All binding posts and their connectionsshould be clean…
Electrical engineering
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