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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 214

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 214
old deeds. Let SN denote the direc-tion of the needle at the time ofthe origuial Survey, and SN itsdirection at the time of the re-sur-vey, a number of years later.Suppose the change to have been3°, the needle pointing so muchfarther to the west of North. Theline SN, which before was dueNorth and… … 87° W. Any line is similarly changed. The proof of this is apparrent on inspecting the figure. Suppose now that a suiveyor, ignorant or neglectful of thischange, should attempt to run out a F=- -^^• farm by the old Bearuigs of thedeed, none of the old fences or cor-ners ^emaiuing. The full lines…

Surveying

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