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 200
s. A form of switch in which the contact pieces are snappedapart by the action of the springs, as shown in fig. 463, so as tomake the duration of the arc as short as possible. The current allowed in each branch circuit of an electric lightingsystem is limited by the insurance rules to a maximum of… … Fig. 467.—Spool of fuse wire. The wire is usually made of an alloy of tin and lead, such ashalf and half solder. Bismuth is frequently added to the alloy to lower the melting point.For half and half solder the melting point is 370° Fahr. The quickness with which a fusewill melt after the current…
Electrical engineering
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