Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 25
circuit. Many semi-automatic key transmitters, called vibroplexor mecograph transmitters, are used, and permit experi-enced operators to signal faster than with the keys alreadydescribed. The horizontally-operated lever has a pendulumextension having an adjustable vibration rate. To form adash the… … Fig. 6. Sounders. Fig. 6 shows a typical sounder. It consistsof a horseshoe electromagnet with two series-connectedcoils protected by hard-rubber shells, and a pivoted brassor aluminum lever carrying a soft-iron armature properlyplaced with respect to the magnet poles. The lever is SIMPLEX…
Telegraph
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