Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 104
rn engagepunch bars which are interposed between the punch hammer and the punches. Thedepression of any loop withdraws the corresponding punch bar ifom in front of its punchso that when the punch hammer is operated by the magnet the corresponding holeis not punched in the tape. Thus if loops 2, 4… … 6. The punch block contains six punches, five of these corresponding to the five units of the code, and the sixth being used to perforate feed holes in the tape. This holeis the third from the top of the tape and is somewhat smaller than and slightly in advanceof the other. The five punches…
Telegraph
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