. Handbook for rangers & woodsmen . hnes or electric-hght linesare crossed underground, the nearest polesbeing set not less than 150 feet from themThese crossings should be taken up irdetail with the proper office and specific instruCtions obtained as to the proper method oiconstruction. Spans crossing railroads must be suspendedfrom poles set far enough back from the track so they will no:reach it in case they fall. Ordinarily they should be bracecor guyed from a direction that will prevent them from fallingtoward the track. The line wire is dead-ended at either sideand two insulators are use
. Handbook for rangers & woodsmen . hnes or electric-hght linesare crossed underground, the nearest polesbeing set not less than 150 feet from themThese crossings should be taken up irdetail with the proper office and specific instruCtions obtained as to the proper method oiconstruction. Spans crossing railroads must be suspendedfrom poles set far enough back from the track so they will no:reach it in case they fall. Ordinarily they should be bracecor guyed from a direction that will prevent them from fallingtoward the track. The line wire is dead-ended at either sideand two insulators are used, as shown in Fig. 42. Spans crossing wagon roads must be suspended at a heightthat will permit the passage of traffic beneath them. AU approaches to crossings are at right angles to the line orroad to be crossed; unless the ends of the crossing spans aredead-ended they are tied with the figure 8 tie; and if the spansare to be 500 feet or more in length, specific instructions as tothe proper method of crossing should be Fig. 42.—Dead-ends at crossing. CONSTRUCTION WORK 47 CONNECTIONS Branch lines connecting with Forest Service lines are dead-ended on a separate insulator. They are left long enough tosupply the connection wire, as shown in Fig. 43, and this is given at least seven turnsabout the main line if gal-vanized iron wire is - drawn copper - wireconnections are made asshown in Fig. 44.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
