Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 27
l the moving parts of the transmitter to come to restbefore the prepared signal is actually sent to the line. 41. The perforator is a mechanical device made up with a system of transverse levers,bars, etc., so arranged that by depressing keys on the keyboard the proper punches areselected and holes… … Fig. 17 not electrically connected with the other apparatus to the telegraph line, and for thatreason will not be included in this general theory. For the present the reader may takeit for granted that it is convenient to prepare a tape for the operation of the transmitteras already described. A…
Telegraph
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