Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 24
escribed. It would be impractical to transmit direct from the selectingkeys to the selecting magnets. Also in order to take advantage of the polar duplex, Page 9 Section 1 Multiplex System 263-C positive and negative impulses must be transmitted, and in order to get an impulsestronger than the line… … RECEIVINGDISTRIBUTOR SELECTING MAGNETS Fig. 13 29. Here we have all the essential features necessary for the operation of a Multi-plex system over a duplexed line. It is necessary to provide only the duplex equipment,and provide both a sending and a receiving set at each station. To do this we must…
Telegraph
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