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A hand-held surveying device for measuring vertical angles; consists of a sighting tube surmounted by a graduated vertical arc with an attached level bubble; used in meteorology to measure cloud height at night, in conjunction with a ceiling light, and in ordnance for boresighting.
Abney level is one of the various forms of clinometers used for the measurement of slopes, taking cross-sections, tracking contours, setting grades and all other rough leveling operations.
It is a light, compact and hand instrument with low precision as compared to the engineerβs level.
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