levelling................

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IT  is a branch of survey which helps in determination of elevation of a given point or object with espect to some specified point or object.
. Common levelling instruments include the spirit level, the dumpy level, the digital level, and the laser level.
The dumpy level is an older style of optical instrument. It is commonly believed that dumpy levelling is less accurate than other types of levelling, but such is not the case. Dumpy levelling requires shorter and therefore more numerous sights, but this fault is compensated by the practice of making foresights and backsights equal.

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