Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 512
ing keys which may be of any ordinary type foreither manual or automatic ringing, according to the necessity ofthe case. This plug and cord circuit terminates in one half of a re-peating coil, between the center points of which is bridged the bat-tery for feeding current to the local subscribers… … SWITCHING OPRa COF^D.ClRCUrr Toul- opna.pos. FIG. 353.—WESTERN ELECTRIC TOLL TRUNK LINE, SYSTEM .^. The two wires of the trunk line extending between the commonbattery office terminate in the second half of the repeating coil atthe toll-switching operators position. Bet\yeen the center pointsof…
Telephone
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