Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 30
FIG. 10.—BELLS CENTENNIAL RECEIVER. … FIG. 11.—BELLS CENTENNIAL TRANSMITTER. mounted as to allow its free vibration close to the pole. Two ofthe instruments are shown connected in a circuit in Fig. 9, Two points will be noticed which have heretofore been absent:that no battery is used in the circuit, and that the transmitting and THE…
Telephone
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