Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 320
current from thebattery, t, is passing through the line of the calling subscriber, thusenergizing its magnet and preventing its display. As the called sub-scriber has not yet responded, the signal, o, will be displayed becausesufficient current cannot pass through the high-resistance bell of… … FIG. 2B1.-CIRCUITS OF DEAN COMMON-BATTERY SWITCH-BOARD. one or both of the subscribers hang up their receivers, when thecurrents through the respective supervisory signal magnets will becut off, their armatures will be released, and the shutters will be dis-played by being forced into a horizontal…
Telephone
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