American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 78
rcuit plan is that when not in use, the battery is notrequired to supply current to the line; another advantage is that the resistance of therelay is not always in the circuit, since the closing of a key cuts out the relay. The relays are provided with local sounders or registers. In some cases a… … MORSE TELEGRAPH SYSTEM—OPEN CIRCUIT. TELEGRAPH CODES. The Morse telegraph code, which is in use exclusively on overhead lines in theUnited States and Canada, and modifications of which are in use in Europe and else-where is composed of dots, dashes and spaces. These are formed by the length of time…
Telegraph
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