Abney level

Abney level

(ˈæbnɪ) n (Surveying) a surveying instrument consisting of a spirit level and a sighting tube, used to measure the angle of inclination of a line from the observer to another point[C20: named after Sir William Abney (1843–1920), British chemist and physicist]

Thesaurus

Noun

1.

Abney level - a surveying instrument consisting of a spirit level and a sighting tube; used to measure the angle of inclination of a line from the observer to the targetsurveyor's level - surveying instrument consisting basically of a small telescope with an attached spirit level rotating around a vertical axis; for measuring relative heights of land