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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 316

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 316
l be d. So proceed as far as de-sired. \ (456) To orient the table.* The operation of orientation con-sists in placing the table at any point so that its Hnes shall havethe same directions as when it was at previous stations in the samesurvey. The French phrase, To orient ones self, meaning to… … With a compass, this is very easily effected by turning the tabletill the needle of the attached compass, or that of the Declinator,placed in a fixed position, pomts to the same degree as when atthe pre\aous station. Without a compass the table is oriented, when set at one end ofa Ime previously…

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