Modern practice of the electric telegraph : a handbook for electricians and operators (1874)
Pope, Frank L., 1840-1895 · New York : D. Van Nostrand · leaf 47
LOCAL SOUNDER. … COMBINATION MAIN LINE INSTRUMENT. Manufactured by L. G. TiUoUon <£ Co., New York. THE MORSE, OR AMERICAN TELEGRAPHIC SYSTEM. 35 line. The line wire L first enters the lightning arresterX, and passes thence through the coils of the relay Mby the binding screws, 1, 2, and thence to the key K,main…
Telegraph
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