The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 584
econdary windingdirectly to line, cutting out the receiver. This makes a veryeffective call, which will pass through very defective lines.The buzzer is also used for sending messages by Morse codesignals. To prevent their being interpreted by the enemy,such messages are often sent in secret cypher.… … lS,*Ill5CJw Fig. 502.—Connections of Military Telephone Set contact breaker of the buzzer to prevent sparking, and anotherone is connected between line and terminal c L. This terminalis used instead of the l terminal when it is required to tap onan enemys line, as then no direct earth is connected…
Telephone
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