A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 82
ned by double offsets. It will be seen that the line A Bcrosses one side of the road at 160 links from A, and the other sideof it at 220. Two methods of keeping the field-notes are given. In the firstform, the offsets to each side of the road are given separately andconnected by the sign +• In the… … 50 + 55 +50 +45 +50 +50 +55 +60 + B 260 240 0 220 20 200 40 180 45 160 0 140 5 120 20 100 15 80 10 60 20 40 20 20 ; 0 A 30 4- 60 10 + 705030100 B 260 • 240 0 220 20 200 40 180 45 160 50 to 0 140 60 to 5 120 70 to 20 100 60 to 15 80 60 to 10 60 70 to 20 40 75 to 20 20 60 to 0 A 30 to 9010 to…
Surveying
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