Electricity for everybody; its nature and uses explained (1895)
Atkinson, Philip · New York, The Century Co. · leaf 223
rtant. Transmitter.—A transmitter, connected with the keyand operated by a small battery, closes and opens thecircuit through the main battery, and also through thecentral ground wire; always opening one circuit as itcloses the other. The neutral relay, for duplex transmission, has beensuperseded… … Fig. 90. The Polarized Relay.—It is unnecessary to wearythe reader with a full description of the polarized relayand its mode of operation. But it may be stated brieflythat it is constructed with a curved steel magnet com-bined with an electromagnet, as shown in Fig. 90. Thelatter has two coils…
Electricity
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