History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 149
sed bySoemmering in 1811, Schilling in 1831, and Henry, Steinheil,and Wheatsone in 1836 and 1837. The receiving magnet, in its improved form (Fig. 69), used forthe purpose of combiningor connecting circuits, isclosely allied in its con-struction to the call, andmay therefore be describedhere,… … Fig. 69. BAINS ELECTRO-CHEMICAL TELEGRAPH. 131 rounded with helices of fine wire. The long or telegraphic circuitis connected with these helices by means of two of the screw-cupson the board. When the current flows, the armature is attractedto the magnet, and the upright bar is brought in contact…
Telegraph
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