Modern practice of the electric telegraph : a handbook for electricians and operators (1874)
Pope, Frank L., 1840-1895 · New York : D. Van Nostrand · leaf 51
purpose of connect-ing one circuit with another, for dividing a circuit intotwo parts, or in short, for any purpose where it is neces-sary to alter the connections of a line or circuit. 62. Fig. 19 shows the simple Button or Circuit Closer, 38 MODERN PRACTICE OF THE ELECTRIC TELEGRAPH. which is… … Fig. 19. are continuous with the screws, D D, passing through thetable and terminating in binding screws, to which thewires are attached. The spring F, pressing againstthe lever, insures a firm contact with the studs. Thiscircuit closer is sometimes, for special purposes, madewith four connections…
Telegraph
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