History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 99
England,* used a combininginstrument, which consisted of a magnetic needle, so arranged asto dip an arch of wire into two mercury cups, when deflected bya feeble current, thus completing the circuit of a local battery,which struck a signal-bell. Davy patented in England, in 1838, * London Repertory… … 1st, to discolor or dye, by electro-decomposition, the calico onwhich he registered his signs; 2d, to actuate an electro-magnet THE MORSE SYSTEM. 81 regulating the motion of the calico ; 3d, to direct the long or tele-graphic circuit to either of two branches, by means of a receivinginstrument…
Telegraph
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