Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 75
the resistances in series with the condensers,while depressing and releasing the key at intervals, untilthe relay armature will not kick with every movement ofthe key. This adjustment signifies that the current growsand decays simultaneously in both relay windings. Thenrestore the pole piece to its… … Fig. II. when operated by generators. The armature moves be-tween two contacts, one being connected to the positiveterminal of one generator and the other contact to thenegative terminal of another similar generator, the two DUPLEX TELEGRAPHY 6i other generator terminals being grounded as shown…
Telegraph
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