Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 54
ore greatly increased. Page 15 Section 2 Multiplex System 263-C 57. We now must return to a further consideration of the corrector and its operationThe corrector magnet is energized by the action of a separate piece of apparatus calleda synchronizing unit. This consists of three neutral relays,… … Fig. 13 58. Whenever the line current reverses from positive to negative the corrector relaycloses on the marking contact. This completes a circuit from positive battery throughthe corrector relay contact and tongue through resistance R and the coil of the breakrelay to negative battery, thus…
Telegraph
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