International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 83
elevations arequickly and correctly estimated and the work of plattinggreatly facilitated. The level notes described in Art. 1 288are platted in Fig. 293. The elevation of some horizontalline is assumed. This elevation is, of course, referred tothe datum line, and is the base from which the other… … Fig. a93. 1291. Grade Lines.—The principal use of a profile is to enable the engineer to establish a grade line, i. e., a line showing the relative proportion of excavation andembankment in the proposed work. The rate of a gradeline is measured by the vertical rise or fall in each hundredfeet of…
Railroad engineering
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