Elements of surveying and levelling; with descriptions of the instruments and the necessary tables (1870)
Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes & Company · leaf 231
s dr). Location of Curves by two Traksits. 43. The surface over which it is necessary to locate a curve,may be of such a character as to render it impracticable for the 228 ELEMENTS OF SURVEYING. [BOOK HI. chainmen to make their measurements; if, howeyer, the variouspoints are accessible to the… … Let A and B be the two tangent points of the curve AvB,and D the intersection of the tangents. If from any point v, on the curve, the lines vA, vB, be drawn,then the sum of the angles vAB and vBA is measured by one-half the arc AB, and is therefore equal to one-half the angle a,or to either of the…
Surveying
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