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 547
Fig. 3,727.—Polarized relay, wall type, with four front and four back neutral contacts and twofront and two back polar contacts. The armature of this relay is itself a permanentmagnet and swings back and forth to either pole of the electromagnet as the currentattracts and repels it or whenever the… … Fig. 3,728.—Slow release neutral relay with six front and back contacts. This relay is equippedwith extra large magnets having the slow release feature added as sometimes required bypolarized wireless rail circuits when it is necessary to prevent the opening of signal circuitsduring the reversal of…
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
