American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 77
t=L^ … MORSE TELEGRAPH SYSTEM—CLOSED CIRCUIT METHOD—THEORY. When any one of the keys in a Morse circuit is open, not one of the remaining keyscan close the circuit, and when any key is operated, all the relays on the line, if they beadjusted, will be simultaneously operated, by reason of the alternate…
Telegraph
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