History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 137
many times asthere are spaces fromany given letter to thenext one which it is de-sired to transmit, count-ing in alphabetical order.The rapid pulsationsare transmitted by thecircuit of conductors tothe magnet and print-ing machine at anotherstation, through the wireI, Fig. 61. The helixof this… … Fig. 63. HOUSES PRINTING TELEGRAPH. 119 helix, and fastened at the bottom by the screw D. To theinner surface of this tube are soldered six or eight soft iron tubes,separated from each other at regular intervals. Above the ironcylinder is an elliptical ring, F, through the axis of which is…
Telegraph
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