Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 283
seconds the set would go out ofsynchronism, for the corrector at the correcting station can operate only when the re-ceived current reverses from positive to negative. To provide these reversals for thecorrector, even when the set is idle, negative was chosen as the selecting battery for theA and C…
Telegraph
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