American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 302
se it is practicable for the terminal stationscf the duplex to utilize the duplex during the time that the single wire station, orstations, may be sending to, or receiving from, the distant terminal station of the du-plex system. It is rendered practicable by turning the 3-point switch tp, Fig.… … ARRANGEMENT FOR CONVERTING SHORT WIRE INTO MAIN LINE WIRE. TP to the left, when the single wire is sending to the duplex, at which times the re-peating station may send to the distant duplex station. In the latter case the 3-point switch tp cuts out the points of the repeating transmitter and,…
Telegraph
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