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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Surveying
The length of a chain is measured from

centre of one handle to centre of other handle
outside of one handle to inside of other handle
outside of one handle to outside of other handle
inside of one handle to inside of other handle

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