Surveying
The station where observations are not made, but the angles at the station are used in triangulation series, is known as

Satellite station
Pivot station
Subsidiary station
Main station

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Surveying
A ’level line’ is a

line passing through the objective lens and the eye-piece of a dumpy or tilting level
line passing through the center of cross hairs and the center of eye piece
line parallel to the mean spheriodal surface of earth
horizontal line

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