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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 54

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 54
on the scale of theplat; i. e. one inch wde, as in the figure, for a scale of two chainsto 1 mch ; two-thirds of an inch wide for a scale of 3 chains ; halfan inch for 4 chains ; and so on. Draw perpendicular lines acrossthe paper at distances representing one-tenth of a chain on the scaleof the… … corner, B ; and note very precisely what divisions of the scale areat these points. Then slide the scale in such a way that thepoints of the scale which had coincided with A and B, shall alwaysremain on the line BA produced, till the edge arrives at the pointC. Then will AC, that is, the distance,…

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