The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 591
ircuit is used as twosingle line and earthcircuits. The transmitting partconsists of a pencil, to thelower end of which isattached, at a wide angle,two arms, which are them-selves attached to theswinging arms of two slid-ing rheostats, shown atB, B in Fig. 507, by whichresistances of from 0 to7000… … Fig. 507.—Connections ofTelautograph arms connected to an inking pen, and to swinging coils inplace of the rheostats, the coils being pivoted between thepoles of horseshoe magnets, with intensifying iron cylinderslike the coils of a DArsonval galvanometer. When a currentis flowing through these…
Telephone
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