. American telephone practice . details too often brings an endlessamount of trouble in the way of rehandling of poles, redigging ofholes and similar useless labor. When the ground is level or gently undulating, no provision needbe made for grading the pole tops. Where, however, the countryis hilly it is well to make a survey of the route with a level, plac-ing the instrument between each successive pair of stakes and takinga front and back sight from each position to the adjacent record of the data thus obtained will enable one to plat the ver-tical section of the route. The profile
. American telephone practice . details too often brings an endlessamount of trouble in the way of rehandling of poles, redigging ofholes and similar useless labor. When the ground is level or gently undulating, no provision needbe made for grading the pole tops. Where, however, the countryis hilly it is well to make a survey of the route with a level, plac-ing the instrument between each successive pair of stakes and takinga front and back sight from each position to the adjacent record of the data thus obtained will enable one to plat the ver-tical section of the route. The profile of the pole tops may then be POLE LINE CONSTRUCTION. 779 platted, care being taken to smooth out all sharp bends in it. Thisis accomplished by putting the tallest poles in the hollows and theshortest on the hilltops. The same results may be accomplished,though not so well, without the use of the level, but it requires anexperienced eye to do it to best advantage. After having decided on the location of the poles, the length of. FIG. 546.—CARRY HOOK. pole for each point and all other preliminary details, such as placingof heavy poles at the corners, the poles may be hauled and distrib-uted along the route. They should be laid with the butt near thestakes and pointing down hill if on a grade. The poles are distributed along the route by any available the line runs along the railroad, they may be rolled from theflat car at the proper intervals and carried to their places by carry-ing hooks (Fig. 546). If the line is a long one and does not followthe line of a railroad, the poles should be unloaded from the cars atconvenient points, and hauled to their proper locations by wagons. Poles of medium length may, under ordinary circumstances, beraised with the cross-arms in place, and as they are much more
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