Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 94
ey. These sets differ fromthose described in connection with Figs. lo and 12 only inthe introduction of the leak relays. The unmarked coilsare 300-ohm protective resistances. Bridge Direct-point Repeater. — The arrangement of therepeater used with the bridge duplex by the WesternUnion Telegraph… … Fig. 21. line at both stations. Reference to the explanation of thebridge duplex and Fig. 16 will indicate that the armaturesof the two repeater relays Pi and Pi and consequentlythose of the leak relays Li and Li rest against their left-hand contacts. Further, no current traverses the twoline…
Telegraph
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