Surveying
Theodolite is an instrument used for

measurement of vertical angles only
measurement of horizontal angles only
tightening the capstan-headed nuts of level tube
measurement of both horizontal and vertical angles

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Surveying
The rise and fall method

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

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