Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 770
rds, any current flowing in either line circuitwill induce currents in the local circuit containing the magnet, M,while currents set up in the coil, 4, by virtue of currents flowingthrough the magfnet, M, will produce no effect in turn upon thecoil, 3. A great many improvements have been made in… … FIG, 531.—ERDMAN REPEATER. devised by Mr. A. W. Erdman, and is shown in Fig. 531, andembodies probably the most radical departure in the structureof telephone repeaters of all since the first was produced. In thisfigure L is the transmitting line, and Lr the receiving line. H isthe diaphragm of the…
Telephone
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