Surveying
The rise and fall method

provides a check on the reduction of intermediate point levels
is less accurate than height of instrument method
quicker and less tedious for large number of intermediate sights
is not suitable for levelling with tilting levels

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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
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

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