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The practical telephone handbook and guide to the telephonic exchange (1906)

Poole, Joseph · New York, Macmillan Co. · leaf 333

An illustration from The practical telephone handbook and guide to the telephonic exchange, 1906, leaf 333 — soft-iron wire forms the core. On this a continuous coil of copper 3<H PRACTICAL TELEPHONE HANDBOOK wire is wound, in the manner shown in Fig. 307. This figurealso shows how connections are made from the coil, or seriesof coils, to the plates of a commutator and the collectingbrushes + and -,… … Fig. 307 wire between each connection. The greater the number ofcoils into which the armature is divided and the greater thenumber of commutator plates, the steadier will be thecurrent derived from it if the driving speed is kept constant.In the generator most generally used for telephone work…

Telephone

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