Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 52
ansmit- SIMPLEX TELEGRAPHY 37 ters which are electrically and mechanically arranged toallow signalling in either direction and in such a way asto automatically prevent one transmitter breaking at therepeater station the Kne circuit which it controls whenthat circuit is repeating into the other. Two… … Fig. 19. are the transmitters, and R and R^ are the relays. Eachrelay has an extra magnet, H or H\ called a holding-coil,mounted above the ordinary magnets so as to act on thesame moving element, as illustrated in Fig. 20. Its wind-ing has a tap at its middle point, so that if current entersat this…
Telegraph
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