Historical sketch of the electric telegraph : including its rise and progress in the United States (1852)
Jones, Alexander, 1802-1863 · New York : G.P. Putnam · leaf 180
not the fault of the elec-trical fluid. The Professor, with one or two assistants, wereindebted to a Francis metallic life-boat—in which they hap-pened to be seated at the time of the explosion—for the safetyof their lives. In producing ignition by the galvanic current, it is neces-sary, as in the… … An operator is seen at a distance with the wires extendingto a receiving magnet, A A, which is constructed on the axial 164 HISTORICAL SKETCH OF principle, and serves to complete tlie circuit for the single cupat B, whicli is to ignite the charge in the neighboring rocks. Electricity in Warfare. In…
Telegraph
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