Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 111
he contact screw is not turned in far enough,the perforator is apt to skip; that is, the punch magnet may fail to operate becausethe contacts barely close when a key is depressed. If the contact screw is set too close,the touch of the perforator will be heavy, due to early operation of the punch… … Fig. 14 7. Plunger Yoke Travel. The travel of the punch magnet plunger yoke determines how far the punches will be driven through the paper and into the die plate. The travelof the plunger yoke shall be just sufficient so that the punch hammer will drive all thepunches through the paper and produce…
Telegraph
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