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

Main station
Subsidiary station
Pivot station
Satellite station

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Surveying
The rise and fall method

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

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