Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 298
he passage of a current through it. This Mr. Dean 276 AMERICAN TELEPHONE PRACTICE. does, and his simplest arrangement of circuits and apparatus is repre-sented in Fig. 235, in which the wires of a telephone line are shownleading to the central office of the telephone exchange. The… … ToTELti-HoME tmC FIG. 236.—DEAN THERMOPILE. the weight of the receiver. The transmitter,!, the thermopile, C, andthe primary, p, of the induction coil, are placed in series in the localcircuit, which is permanently closed. The resistance coil, r, which is here shown in proximity to thethermopile,…
Telephone
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