The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 277
serted in the 25o PRACTICAL TELEPHONE HANDBOOK jack, the test connection is cut off by the operation of therelay. The same relay when actuated puts an earth con-nection on the centre of a double-wound retardation coil of1000 ohms total resistance, the connection passing throughthe coil of a… … Pilot Relai^ rig. 262.—Order-Wire Junction between Magneto Exchanges indicator at the outgoing or originating end, but notaffecting the clearing relay at the incoming end of the junctionline. The operator at the outgoing end disconnects, and thearmature of relay R completes the connection of the…
Telephone
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