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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 226

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 226
III. Usually, one cross-hair is horizontal, and thoother vertical, as in Fig. 217, but sometimes theyare arranged as in Fig. 218, which is thought toenable the object to be bisected with more preci-sion. A horizontal hair is sometimes added. The cross-hairs are best made of platmum wire,drawn out… … 218.

Surveying

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