Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 30
tage is ^^ithdrawn the relayarmature is not immediately drawn back by the spring be-cause of the residual magnetism in the cores. To attainquick release the armature when drawn toward the- magnetpoles should not quite touch them. This condition is ob-tained by the stop screws or else by the… … Fig. the District Telegraph Messenger Ser\dce, an ink-recordingsounder or register may be used. A register consists of anelectromagnet and a pivoted armature lever which pressesa paper tape against an inked wheel when actuated. Spring- i6 TELEGRAPH ENGINEERING driven clockwork moves the tape past…
Telegraph
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