. Journal of electricity. -grained Douglasfir, painted with two coats of yellow cement paint. Avariety of sizes were used with the various types of, construction above described. Crossarms on W and Xconstruction have across section 3J4 inch by 5% U and V construction they are 9^ inch by 9]iinch. BracesBraces were not ordinarily required with the typeof construction used. In the twin circuit construction,angle iron braces are insulators, No. 3538, are used as a stand-ard. Four constitute a string in vertical suspension, and 5 when used horizontally in strain. I
. Journal of electricity. -grained Douglasfir, painted with two coats of yellow cement paint. Avariety of sizes were used with the various types of, construction above described. Crossarms on W and Xconstruction have across section 3J4 inch by 5% U and V construction they are 9^ inch by 9]iinch. BracesBraces were not ordinarily required with the typeof construction used. In the twin circuit construction,angle iron braces are insulators, No. 3538, are used as a stand-ard. Four constitute a string in vertical suspension, and 5 when used horizontally in strain. In single polework and two-pole towers of the T type, singlestrings are used. In U and V construction paral-lel strings are employed, properly spaced and bal-anced by means of steel yokes; and in S construc-tion there are 4 strings in parallel. Attachment of Insulators Insulators in suspension are attached to crossarmsby means of J bolts and C hooks, a method whichgives full flexibility at point of suspension in all direc-. THE STANDARD TRANSPOSITION Sixteen mile barrels are the rule. Transpositions are effected insingle circuit construction by merely reversing one pole top. Theturn is counter clockwise. tions, and seems to obviate any tendency of the con-ductor to break close to the clamp. No. 4333 Lockesuspension clamps are used; these are likewise of aflexible type. Horizontal strings of insulators are at-tached to poles or crossarms by means of universaldeadend clevises, Hubbard No. 555. Ground Guards In accordance with the desires of the Railroad Commission, special angle iron ground guards were installed at all spans exceeding 1000 feet which cross over railroads, telephones or main traveled highways.
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Keywords: ., bookcentury1900, bookdecade1910, bookidjo, booksubjectelectricity
