The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 237
Line 1 Station. A Fig. 237 in a shunt between the two conductors of the connecting cords,retardation coils, R.C., being interposed between the batteryand the cords on each side, as shown. The original patentshowed a pair of coils on one or both sides of the battery, asshown in Fig. 238, but a pair… … Fig. 238
Telephone
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