Abney level

Abney level

[ab-nee]
noun Surveying.
a hand level for determining elevations and angles of slope.
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Abney level (ˈæbnɪ)
 
n
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]

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