Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 25
ination received. These steps must now be taken up. 34. To control the sending keys by hand is possible, but a much more satisfactorymethod has been developed. This method makes use of two pieces of apparatus calleda transmitter and a perforator. 35. Let us suppose that we make the sending keys in… … Fig. 15 Let us assume also that when we placed double battery on the keys we made the backcontacts the marking contacts by connecting to them the polarity which, when con- Page 11 Section 1 Multiplex System 263-C nected to the line by means of the keys, will send an impulse that will operate the…
Telegraph
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