. The elements of railroad engineering . ment. Eleva-tion. Grade. Remarks. + B M. on Poplar treeleft; Sta. 40 10 ft. 40 41 41 -f GO 42 43 T. P. - + 44 45 46 47 48 T. + 49 50 51 52 53 T. (699) The ground to the right of the center line has anascending slope of 11° for a distance of 120 feet, and to 1 SURVEYING. the left of the center line a descending slope of 0^ for adistance of 117 feet, where the slope changes to a descend-ing slope of 5° for a distance of Go feet; how
. The elements of railroad engineering . ment. Eleva-tion. Grade. Remarks. + B M. on Poplar treeleft; Sta. 40 10 ft. 40 41 41 -f GO 42 43 T. P. - + 44 45 46 47 48 T. + 49 50 51 52 53 T. (699) The ground to the right of the center line has anascending slope of 11° for a distance of 120 feet, and to 1 SURVEYING. the left of the center line a descending slope of 0^ for adistance of 117 feet, where the slope changes 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 feet, how many5-foot contours are included by the given slopes, and whatare their respective distances from the center line ? (700) The angle of slope is 3°; what is the horizontaldistance for a rise of 10 feet ? (701) An instrument is stationed at A, Fig. 15, 100 feetfrom the base of a church spire B C. The horizontal line A/ ^. 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 angle C A B is 45° 20; required, the height of thespire. Ans. feet. (702) The height of barometer // at lower station is SURVEYING, 1307 in. ; the temperature / = 74; the height of barometer// at the higher station is 2( in., and the temperature/ = 58°; what is the difference in elevation ? Ans. 2,454 feet. (703) What is hydrographic surveying ? (704) What stage of tide is the basis tor all soundings ? (705) What is a tide gauge ? LAND SURVEYING. (ARTS. 1309-1344.) (70(j) What are the names of the general divisions intowhich the pubHc lands of the United States are divided ? (707) Give the dimensions and contents of each. (708) (a) Define a Principal Meridian, (d) How is itestablished ? (r) What boundaries are marked on it ? (709) What causes convergency of meridians, and whateffect does such conv
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
