Modern practice of the electric telegraph. A handbook for electricians and operators (1872)
Pope, Frank L. (Franklin Leonard), 1840-1895 · New York : D. Van Nostrand · leaf 150
es. E is the local battery, and Lthe sounder. S is a common ground switch, turn-ing on two points, 2 and 3. In the diagram the switchis turned to 2, and the eastern relay, therefore, repeatsinto the western circuit, while the western relay ope- MODERN PRACTICE OF THE ELECTRIC TELEGRAPH. 135 rates… … sequently the soun<dcr, L, ceases tpwork. The opera-tor in charge thenturns the switch to3, and the reverseoperation takesplace; the westerarelay repeats intothe eastern circuit,and the easternrelay operates thesounder. The soun-der being of coarse wire, offers but a slight resistance tothe…
Telegraph
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