Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 91
This feeds the tape forward the distance between two consecutivefeed holes (1/10 inch). 15. The exact position of the tape with respect to the punches is maintained by meansof a jockey roller which engages the teeth of the feed ratchet. 16. The operation of the operating, or punch, magnet is… … SPACE LEVER Fig. 6 17. To make it possible to correct conscious errors made by the operator a means isprovided for moving the tape back one feed hole at a time and perforating, in place ofthe wrong character, the LTRS character. Since this character merely causes the printerto shift from the upper…
Telegraph
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