[Electric engineering.] . incorrect result. However, it is about the only way wherethere is no available good wire and when the tests must bemade from one end only. The normal resistance of theline must be known from some previous measurement,unless it can be calculated from the length and size of the 15 ELECTRIC TRANSMISSION. 37 wire. Let this resistance be a; then measure the resistanceof the line B B, with the distant end B grounded as shownin Fig. 39, and call this c. Also measure the resistance. Fig. 40. with the distant end open, as in Fig. 40, and call this b the resistance x
[Electric engineering.] . incorrect result. However, it is about the only way wherethere is no available good wire and when the tests must bemade from one end only. The normal resistance of theline must be known from some previous measurement,unless it can be calculated from the length and size of the 15 ELECTRIC TRANSMISSION. 37 wire. Let this resistance be a; then measure the resistanceof the line B B, with the distant end B grounded as shownin Fig. 39, and call this c. Also measure the resistance. 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
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