A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &c. Illustrated by four hundred engravings, and a magnetic chart (1875)
Gillespie, W. M. (William Mitchell), 1816-1868 · New York, D. Appleton · leaf 84
re determined by double offsets. It will be seen that theline AB crosses one side of the road at 160 links from A, and theother side of it at 220. CHAP. III.] Offsets. 77 Two methods of keeping the Field-notes are given. In the ifirstform, the offsets to each side of the road are given separately… … B 260 240 0 220 20 200 40 180 45 160 50+ 0 140 65+ 5 120 60+20 100 45+15 80 50+10 60 50+20 40 55+20 20 60+ 0 A 30+6010+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 805030100 (118) These…
Surveying
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