Modern practice of the electric telegraph. A handbook for electricians and operators (1872)
Pope, Frank L. (Franklin Leonard), 1840-1895 · New York : D. Van Nostrand · leaf 101
e wires at the joints. In testing for conductivity, with the distant end ofthe wire to ground, as in Fig. 54, the result is some-times interfered with by earth currents. It is there-fore better, when practicable, to use the loop method,by connecting the wire to be measured in a loop withanother… … CD J3 FIG. 54. earth, otherwise the leakage at each insulator will de-crease the apparent resistance, especially if the insula-tion is defective. For instance, two wires on the samepoles, disconnected and looped at the distant end, hada resistance of 6,475 ohms when the battery was en-?tirely…
Telegraph
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