Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 89
re 3 the selecting and contact bars are not pivoted, but slideon rollers along inclined planes punched in the bars themselves. When a key is de-pressed and one or more of the bars are operated they are given a right hand, as well asa downward, movement. This right hand movement operates the… … Fig. 3 8. The punches are assembled into the punch block. There are five punches usedfor punching the letter or character combinations, and one punch for punching the feedholes in the tape. This punch is of a smaller diameter but somewhat longer than theother punches. 9. The punches are held away…
Telegraph
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