American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 300
t c of relay e, by the formation of an extra local circuit,I, 2, 3, 4, 5, 6, around the said contact points, via the lever of rt, at the moment whenthe main line is opened at x. When the single wire is operated from an outsidepoint the polar relay is not affected, and, consequently, rt remains… … -^/wwwv
Telegraph
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