Modern practice of the electric telegraph : a handbook for electricians and operators (1874)
Pope, Frank L., 1840-1895 · New York : D. Van Nostrand · leaf 148
while the western relay ope- MODERN PRACTICE OF THE ELECTRIC TELEGRAPH. 135 WEST rates the sounderthe circuit between 1 and 2 throughthe sounder and local battery being common to boththe main and local currents, a If the western operator breaks the relayM opens/ and con-sequently the soun-der, L,… … Juu. 61 der being of coarse wire, offers but a slight resistance tothe passage of the main current. 172. Bradleys Tangent G-alvanometer.—The com-mon galvanometer used for the measurement of elec-tric currents consists of a magnetized steel needle,suspended in the centre of a hollow frame covered…
Telegraph
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