Inside Out Library · Explore

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 78

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 78
CHAP. III.] To set out Perpendiculars 1 … so as to make precisely half a right fi-- ^2. angle with the line of sight, -whichpasses through a sht on one sideof the box, and a vertical hairstretched across the opening on theother side, or a mark on the glass.The box is held in the hand overthe spot where the perpendicular isdesired, (a plumb…

Surveying

Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.

More pictures 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

More like this