Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 106
f the tape does not pass in front of the tension leverthe feed roll will be forced to pull against the weight of the tape reel in moving the tapeforward and the feed holes are apt to be torn or elongated. 11. Provision is made for moving the tape backward to facilitate the correction oferrors made… … this lever is first pushed to the right its edge engages a pin projecting from the feed pawl,thus moving the feed pawl out of mesh with the feed ratchet. Further movement ofthe back spacer lever permits its pawl to engage a tooth on the star wheel and rotate thefeed roll shaft backward one space.…
Telegraph
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