. Electric railway review . -sulators, because of the deposit even during dry weather, andespecially at night, of a saline coating covering the insulatorand eating into any joint or crack. This gave a rapid deteri-oration of the insulator and especially a leakage of the cur-rent through this deposit carrying the current around theinsulating material. The question of proper insulation of the two trolley wireswas solved by the use of two Keystone double-curve hangers,with a double-clevis giant strain insulator bolted betweenthem, giving 18 inches space between the two trolley each of th
. Electric railway review . -sulators, because of the deposit even during dry weather, andespecially at night, of a saline coating covering the insulatorand eating into any joint or crack. This gave a rapid deteri-oration of the insulator and especially a leakage of the cur-rent through this deposit carrying the current around theinsulating material. The question of proper insulation of the two trolley wireswas solved by the use of two Keystone double-curve hangers,with a double-clevis giant strain insulator bolted betweenthem, giving 18 inches space between the two trolley each of the outer ends of the double-curve hangers there 528 ELECTRIC RAILWAY REVIEW September. 1906. was bolted a regular giant strain insulator with the usual?s-inch stranded steel suspension wire made up into theeye-end of the giant strain insulator. The other ends of thesuspension wire were made up into eye bolts in the polesin the usual manner. Arrangement of Wires on suspensions followed the same construction, sub-. improvements at Key West. Fla.—Roadbed and Bracket OverheadConstruction. stituting one single-curve hanger for one of the double-curvehangers, with the suspension wires arranged according toeach special case. A system of breaking of circuits by the use of sectioninsulators was adopted with the double-trolley overhead- With this type of construction each V-frog and all wiresconnecting directly to it are of the same polarity; the posi-tive wire, for instance, runs through the frog and out onboth branches of the curve, but ends in a section insulatoron one branch and continues positive in the other extension of the first wire through the section insulatorbecomes the negative wire until the other end of the switchis reached, when another section insulator performs a likeservice, and the original arrangement of positive and nega-tive sides is restored. Four section insulators are employedto each switch. That portion of the trolley wire cut off bythe
Size: 1341px × 1863px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreetr, bookyear1906
