Surveying
If the intercept on a vertical staff is ob-served as 0.75 m from a tacheometer, the horizontal distance between tacheometer and staff station is

75 m
25 m
50 m
7.5 m

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Surveying
The rise and fall method

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

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Surveying
Circumpolar stars

Are seldom seen near the pole star
Remain always above the horizon
Rotate round the celestial pole
Rotate round the North Pole

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