Elements of surveying and navigation : with a description of the instruments and the necessary tables (1847)
Davies, Charles, 1798-1876 · New York : A.S. Barnes & Co. · leaf 76
tal. Let us suppose that we have measured the base line, andthe two angles of elevation, and CAB = Q15 yardsfound ?^ = 15° 36 (2)50 = 270 29;required the altitude DC. First: ADB=DBC-A=2i 29-15 36 = ii» 53. In tlie triangle ADB, to find BD. As sin D 11° 53 . ar. comp. , 0.686302 : sin A . 15° 36 . .… … HEIGHTS AND DISTANCES. 71 PROBLEM III. To determine the perpendicular distance of an object below a givenhorizontal plane, 91. Suppose C to be directlyover the given object, and A thepoint through which the horizontalplane is supposed to pass. Measure a horizontal base lineAB, and at the stations A…
Surveying · Navigation
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