American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 256
ack of the current through the con-cealed wires of a cable, affords the necessaryknowledge to the skilled electrician, honest ordishonest, to substitute another current for theprimary one, without disturbance of the normalcondition of any apparatus through which itpasses. The two wires of a battery… … tions take any number of turns, the galvanome-ter will determine, at any point, which is the re-turning wire, as easily as it can be traced bythe dotted line in the figure. If at any placebetween a and b metallic contact be made be-tween one wire and the other, the electric cur-rent will not pass…
Clocks and watches
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