The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 249
erence of poten-tial between the two coat-ings of the condenser beingreduced when a currentpasses through the tip con-ductor, the P.D. havingbeen previously equal to thefull voltage of the battery.Speaking Connections.—Fig. 246 shows the sim-plified speaking circuitwhen two sub-stations… … COMMON B4TTERY MULTIPLE SWITCH-BOARDS 225
Telephone
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