. The Street railway journal . insulator is madein three sizes. One of the larger sizes has been tested by Pro-fessor Morton, of Stevens Institute of Technology, and hasshown an insulation resistance of ,000 megohms and a break-ing strain of 6,700 pounds. In nearly every case this type ofinsulator is of sufficient strength, but where unusual strains areput upon insulators, or in large cities where iron poles andheavy span wires are used, and where there is a constant in-tense jarring strain, it has been found advisable to use theBrooklyn strain insulator, which is both a turnbuckle and ani
. The Street railway journal . insulator is madein three sizes. One of the larger sizes has been tested by Pro-fessor Morton, of Stevens Institute of Technology, and hasshown an insulation resistance of ,000 megohms and a break-ing strain of 6,700 pounds. In nearly every case this type ofinsulator is of sufficient strength, but where unusual strains areput upon insulators, or in large cities where iron poles andheavy span wires are used, and where there is a constant in-tense jarring strain, it has been found advisable to use theBrooklyn strain insulator, which is both a turnbuckle and aninsulator and will safely stand a pull of 12,000 pounds in thesmaller and of 18,000 pounds in the larger size. The feed wireand cable insulators are very strong and will carry a 500,000c. m. cable or cables up to one and one-half inches in 1 shows a car-house insulator of unusual strength used inthe car-houses of the North and West Chicago roads. Fig. 2 isan improved trolley frog having no depression and giving a. FIG. 1.—CAR HOUSE INSULATOR. FIG 3.—PONY SWITCH.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
