Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 55
oses theeastern circuit at y, which is followed by the closing ofcoil h at X. The distant eastern relay is thus energized.Signalling in the reverse direction is accomphshed in thesame manner. Front-contact Shunt-locking Repeater. — The repeater setused by the Western Union Telegraph Co. consists of… … Fig. 22. The contacts of the transmitter are so arranged thatwhen the armature is released the auxiliary contact opensa Kttle before the main contact, and when the armature isattracted by its magnet it closes a trifle later than the maincontact. The auxiliary contact A is bridged across thelocking…
Telegraph
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