[Electric engineering.] . Fig. 40. with the distant end open, as in Fig. 40, and call this b the resistance x to the partial ground from the test-ing station is given by the following formula: x = c — \/{b — c) [a — c). (3.) By dividing x by the resistance per unit length of thewire, known from some previous measurements or by a cal-culation from its size, length, and a table of resistances forthe kind of wire under consideration, the distance to thegrounded point may be obtained. 43. To Locate a Cross by tlie Tarley LoopMethod.—First insulate the distant ends of the two crossed. Fig

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[Electric engineering.] . Fig. 40. with the distant end open, as in Fig. 40, and call this b the resistance x to the partial ground from the test-ing station is given by the following formula: x = c — \/{b — c) [a — c). (3.) By dividing x by the resistance per unit length of thewire, known from some previous measurements or by a cal-culation from its size, length, and a table of resistances forthe kind of wire under consideration, the distance to thegrounded point may be obtained. 43. To Locate a Cross by tlie Tarley LoopMethod.—First insulate the distant ends of the two crossed. Fig. 41. wires. Then connect as shown in Fig. 41 and measure theresistance from D to B through the cross F. Let the/. III.—10 38 ELECTRIC TRANSMISSION. 15 resistance of the cross be z ohms and the resistance foundby balancing the bridge be R ohms. Then, R = x+y-\-z. (1) Now ground either wire, say D E, anywhere beyond the

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