Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 105
d against theratchet by means of a spring. When the punch hammer is moved forward by the actionof the punch magnet, the feed pawl also moves forward and engages a tooth of the feedratchet. When the punch magnet is de-energized, the hammer spring pulls back thepunch hammer and the feed pawl in… … Fig. 7
Telegraph
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