American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 223
f the battery from the line. {See j^ages 2S7, 288). 184 AMERICAN TELEGRAPHY. Polarized relay.—The instrument corresponding to r in Figs. 149, 150 andPR in Fig. 152, and which is designed to respond, at a distant station, to the movementsof a pole-changer at a home station, is termed a poh\rized… … The polarized relay is a combination of a permanent magnet and an electro-magnet. The electro-magnet consists of short cores made of the best Norway softiron, surrounded, (when intended for differential duplex Avorking,) by ; differentiallywound coils, each having a resistance of about 400 ohms. In…
Telegraph
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