The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 475
446 PRACTICAL TELEPHONE HANDBOOK … Fig. 420.—Plan of Battery Reverser resistance is known, it is much better to make up a loopcircuit with it, as an earth return introduces errors due to faulty earth con-nections and earthcurrents. The lat-ter can be elimin-ated by making asecond test with areversed batteryconnection, andtaking the…
Telephone
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