Modern practice of the electric telegraph : a handbook for electricians and operators (1874)
Pope, Frank L., 1840-1895 · New York : D. Van Nostrand · leaf 35
r style, which embosses amark upon a narrow strip of paper, moved uniformlyalong by clock-work. As long as a current continuesto flow through the coils of the electro-magnet thearmature is attracted, and a mark is made upon themoving paper. As soon as the circuit is broken thearmature ceases to be… … Fig. 10. 52. The Morse Signal Key is shown in fig. 10.* Itconsists of a brass lever, A, four or five inches in length,which is hung upon a steel arbor, Gr, between adjustableset screws, D I), in such a manner as to allow it tomove freely in a vertical direction. This movement,however, is limited in…
Telegraph
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