. Development and electrical distribution of water power . Fig. 56. POLE LINE AND ACCESSORIES 127 the figures, and it is obvious that the strain on the porcelain iscompressive. Figs. 59 and 60 show the methods of using these link 59 shows the suspension of a wire hanging from a cross-arm. Fig. 57. and below it. Fig. 60 shows the horizontal or tension link insula-tors attached to a supporting tower, and to which the ends of thetransmission wire are fastened. The wires are in the latter casepractically dead-ended, but the line is made continuous by a loose connecting wire which j
. Development and electrical distribution of water power . Fig. 56. POLE LINE AND ACCESSORIES 127 the figures, and it is obvious that the strain on the porcelain iscompressive. Figs. 59 and 60 show the methods of using these link 59 shows the suspension of a wire hanging from a cross-arm. Fig. 57. and below it. Fig. 60 shows the horizontal or tension link insula-tors attached to a supporting tower, and to which the ends of thetransmission wire are fastened. The wires are in the latter casepractically dead-ended, but the line is made continuous by a loose connecting wire which joinsthe two conductors as indica-ted in the figure. The preferredpractice is to use the tension in-sulators about every mile, andsuspension insulators at the inter-mediate supporting points. Thisproduces independent sections ofwire, each one mile in length,supported at proper intervals. With these insulators anypractical attainable voltage maybe used, as each disc is capableof carrying 25,000 volts with afactor of safety against arcing around from one face to the otherof about 2\. For higher voltages the insulators are simply placed in
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