Surveying
The rise and fall method

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

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Surveying
The cross hairs in the surveying telescope are placed

much closer to the objective lens than to the eye piece
much closer to the eye-piece than to the objective lens
anywhere between eye-piece and objective lens
midway between eye piece and objec-tive lens

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