. American telephone practice . POLE LINE CONSTRUCTION. 803 joint is advantageous in this respect, in that it is not necessary tocut the line wire to apply it. The method of making transpositions on copper wire is shownin Fig. 588. This is done by cutting the wires on the pole sideabout 20 inches from the cross-arm, and slipping on each a halfMclntyre sleeve, with which the wires on the cross-arm are dead-ended, one in the lower groove and one in the upper groove, of therespective transposition insulators, leaving the ends FIG. 590.—TELEPHONE AND POWER CIRCUIT. About six feet of s
. American telephone practice . POLE LINE CONSTRUCTION. 803 joint is advantageous in this respect, in that it is not necessary tocut the line wire to apply it. The method of making transpositions on copper wire is shownin Fig. 588. This is done by cutting the wires on the pole sideabout 20 inches from the cross-arm, and slipping on each a halfMclntyre sleeve, with which the wires on the cross-arm are dead-ended, one in the lower groove and one in the upper groove, of therespective transposition insulators, leaving the ends FIG. 590.—TELEPHONE AND POWER CIRCUIT. About six feet of slack is then joined to the wires on the cross-armside by using whole Mclntyre sleeves. Half sleeves are then slippedon and the wires dead-ended in the vacant grooves of the transposi-tion insulators. In dead-ending the stationary clamping tool shouldbe held next to the insulator, so that the twists will be made in thelong section. Fig. 389 shows the method of crossing over the wireswhere the two wires transposed are on the opposite sides of thepole. In making transpositions a good, though more expensiveway, is to use double cross-arms at the transposition poles, dead- 804 AMERICAN TELEPHONE PRACTICE. ending the wires on each and bridging across by bridle wires inmuch the same manner as shown. It is frequently necessary to run a telephone line on the samepoles with a high-tension power circuit. Induction from the powerwires is of course under these conditions very likely to render con-versation impossible, especially if the cu
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