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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 90

An illustration from 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, leaf 90
(126) Offsets are necessary additions to almost every othermethod of surveying. In the smallest field, surveyed by diagonals,unless all the fences are perfectly straight lines, their bends mustbe determined by offsets. The plat (scale of 1 chain to 1 inch),and field-notes, of such a case are given… … 0 0 360 6 315 10 275 UJ n 5 215 eS 0 150 0 115 10 80 5 65 8 B or B 0 125 UJ 11 90 Q 00 23 62 12 22 0 A L. . O U O 2 a _i

Surveying

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