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 141
are arranged in such amanner that the direction of the current in the line dependson whether the key is in its raised or depressed position.As in the case of the differential method, the current dividesat the relay, which instead of being of the differential type isknown as a polarized relay. In… … CONTACTPOST Fig. 3,082.—Essential parts of a walking beam type pole changer. As can be seen it is impossiblefor all three wires of the reversing circuit to be connected at any instant, that is beforeeach reversal, the circuit is broken, thus interposing an air gap; this is an undesirable con-dition…
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
