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 65
another connects p and /,thus keeping the extra local circuit constantly closed,and the armature lever d withdrawn from interferencewith a. 52 MODERN PKACTICE OF THE ELECTRIC TELEGRAPH. The same thing may be accomplished by causing thebutton to break the extra local circuit entirely, whenthe… … J 80. BUNNELLS EEPEATER.—The arrangement of themain circuits in this repeater is exactly the same as in THE MORSE, Oft AMERICAN TELEGRAPHIC SYSTEM 53 the ordinary button repeater, and will be readilyunderstood by reference to fig. 29. The eastern mainwire enters at the right, passing through the…
Telegraph
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