International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 283
30.5 ^feet from the center ^line. The rod is ac-cordingly held at 30.5feet from the centerline. If the rod read-ing at this distanceis the same, i. e., 9.5feet, it marks thefoot of the slope, anda stake marked F.15.0 is driven in theplace of the rod.Usually the rod willnot read exactly thesame when… … RAILR(3AD CONSTRUCTION. 873 located by means of rods and a hand level. First, a pointC is found where the line of sight from the level A cutsthe surface of the ground. A cross-section rod, which issimilar to a transit pole, is held at this point, which is5.2 feet below grade. At 5.2 feet above (T,…
Railroad engineering
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