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 86
SEC. L] MEASUREMENTS. 83 ill the triangle ^i^6, we have two angles and the included side,to fxud the side JBA. POURTH METHOD. 40. Let AC be the distancerequired. Lay off the right angleCAB, and measure AB, any con-venient distance. At B lay off theright angle CBI), and fix the pointD, carefully, in… … (Legendre, Bk. IV., Prop. 23.) XoTE. — When such problemsoccur in practice, the distance ACis usually a portion of a longer line, so that the line CAD iswell marked by stakes or pins, before AB is measured. IV, To prolong a line beyond an obstacle. 41. Let OA be the line tobe prolonged. Lay off…
Surveying
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