Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 332
through this path, instead 310 AMERICAN TELEPHONE PRACTICE. of through the impedance coil, the fluctuating voice currents pass.It might be thought that the presence of the impedance coil wouldmaterially reduce the receiving efficiency of the station, but what-ever reduction of efficiency does occur… … FIG, 2C1.—COMMON BATTERY WALL SET—CLOSED. the talking apparatus are alternately brought into service. It willbe seen that when the hook is raised the conditions shown in Fig.259 exist. When, however, the hook is depressed the transmittercircuit is open, as is also the circuit of the impedance coil,…
Telephone
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