Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 299
yyyyyyYV V V V V ?V V Y VyV V … Page 17 Section 7 Multiplex System 263-C in the balancing block. The triple head has an odd number of segments, hence cannotbe divided into equal number of plus and minus battery connections, so that when thesending plug is placed in the balancing block, so-called flat wheel alternating current…
Telegraph
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