Surveying
The type of surveying which requires least office work is

theodolite surveying
plane table surveying
tacheomefry
trigonometrical levelling

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Surveying
The error due to eccentricity of inner and outer axes can be eliminated by

double sighting
taking mean of several readings distributed over different portions of the graduated circle
taking both face observations and taking the mean of the two
reading both verniers and taking the mean of the two

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Surveying
Circumpolar stars

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

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