History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 96
;it is able therefore to mark dots and dashes, which, as we havesaid, is sufficient for forming a complete alphabet. The transmitting apparatus is a very simple contrivance ofa lever and anvil (Fig. 37),designed simply for themore easy opening and clos-ing the circuit than couldbe done by holding… … 78 ELECTRIC TELEGRAPH APPARATUS. lines in this country. It consists of a lever mounted on a hori-zontal axis, with a knob of ivory for the hand at the extremity of
Telegraph
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