Ternant, A. L. (Alcide Ludovic), 1832-1884 · London ; New York : G. Routledge and Sons · leaf 246
THE TELEGRAPH 228 ing to be written down at once by the clerk, introduce two sources of error. In some apparatus the silk fibres are suppressed by making the siphon move directly with the coil (fig. 161). Thus the difficulty of electrifying is removed, and the pressure of the atmosphere suffices to… … this one subject. We shall however here confine our attention to the apparatus now used in overhead and sub¬ marine lines, and to the most improved forms of the me¬ chanism. Vail’s apparatus indented a slip of paper by a style with the well-known signals of the Morse code. All the apparatus that…
Telegraph
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