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 198
between the contact sur-faces, the mechanism of a switch provides a sliding contact. In the general design of switches, all parts which carry current aregiven a cross sectional area of at least one square inch per 1,000 amperesif they be made of copper, and about three times as much if made… … he 462.—Triple pole, double break double throw knife switch for very heavy current. Theblades are made up of numerous strips to give adequate contact area. A double throwswitch is used when it is desirable to open one circuit and immediately close another, or totransfer one or more connections from…
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
