International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 86
the ground. The remain-der is the difference between the elevation of the surfacewhere the topographer stands and the surface where the rod-man stands. The tapemen having measured the distancebetween the two points, the rate of slope is determined bydividing the distance measured by the difference… … Fig. 296. where the slope changes, holding his rod, which measures16 feet in length, at that point. The topographer sightswith his hand level and reads 7.5 feet on th^rod. From thisreading he mentally subtracts 5.3 ft., the height of his eye G7G SURVEYING. above the ground. The remainder, 2.2 ft.,…
Railroad engineering
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