Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 20
cts his end of the circuit to the positive generator D4, and currentflows over the line from Wyoming to Nevada. This results, as shown in Figure 8, inreversing the current through the polar relay at Nevada, throwing its armature to the~>ac;ng position. The polar relay at Wyoming is, of course,… … ML-LINE W|RE = I550 80v.=P,
Telegraph
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