Surveying
A ’level line’ is a

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

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Surveying
The prismatic compass and surveyor’s compass

give whole circle bearing (WCB) of a line and quadrantal bearing (QB) of a line respectively
both give WCB of a line
both give QB of a line
both give QB of a line and WCB of a line

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