Modern practice of the electric telegraph. A handbook for electricians and operators (1872)
Pope, Frank L. (Franklin Leonard), 1840-1895 · New York : D. Van Nostrand · leaf 126
ing-machine. At the back of the tableare six binding screws to which are attached the lineand ground wires, and the wires leading to the mainand local batteries. The instrument operates uponwhat is known as the open circuit principle, eachstation transmitting with its own main battery—theline at… … I a: «; H RECENT IMPROVEMENTS IN TELEGRAPHIC PRACTICE. 113 The printing apparatus is placed upon a circulariron base in the centre of the table. In front of it isplaced a dial containing the letters of the alphabet,arranged in a circle and provided with an index orpointer, mounted upon a horizontal…
Telegraph
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