International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 725
es to a descend-ing slope of 5° for a distance of Go feet; how are the slopesrecorded in the topographers book ? If the elevation ofthe ground at the center line is 75.0 feet, how many5-foot contours are included by the given slopes, and whatare their respective distances from the center line ?… … Fig. 15. X^ of sight A C from the instrument is 5 feet above the baseof the spire, which at that point is 30 feet in diameter.The angle C A B is 45° 20; required, the height of thespire. Ans. 121.345 feet. (702) The height of barometer // at lower station is SURVEYING, 1307 20.40 in. ; the…
Railroad engineering
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