Surveying
Which of the following errors is not eliminated by the method of repetition of horizontal angle measurement ?

error due to wrong adjustment of line of collimation and trunnion axis
error due to displacement of station signals
error due to inaccurate graduation
error due to eccentricity of verniers

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Surveying
The rise and fall method

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

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