The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 98
Fig. 63 … Fig. 64 76 PRACTICAL TELEPHONE HANDBOOK The battery being joined up as shown, any movement ofthe diaphragm causes an increase of pressure on one carbonand a decrease on the other, so that the current through onecarbon is increased and through the other decreased. As,however, the currents are…
Telephone
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