International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 352
d is the sum ofrtZ^+(^V + r^/ = 191.546feet. This method ofmeasurement is possiblewhere the slopes are soabrupt as to render theuse of the plumb-bobpractically impossible. 1506. Stationing. —Stations are estab-lished at each 50 feet, andif the surface be veryrough, at each 25 feet, inorder that a… … 942 RAILROAD CONSTRUCTION. transit. The tangent distances are calculated and the P. C.and P. T. located by direct measurement. The work andcalculations are repeated many times, and every possibleprecaution taken to secure perfect accuracy of results.
Railroad engineering
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