Surveying
The rise and fall method

provides a check on the reduction of intermediate point levels
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

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Surveying
Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.

By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres
By subtracting their longitudes if places are in the same hemisphere
By adding their longitudes if places are in the different hemispheres
All of these

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