Surveying
To avoid large centering error with very short legs, observations are generally made

To a target fixed on theodolite tripod on which theodolite may be fitted easily
By using optical system for centering the theodolite
To chain pins
All listed here

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Surveying
Pick up the incorrect statement from the following. In a spherical triangle

Every angle is less than two right angles
Sum of the three angles is equal to two right angles
Sum of any two sides is greater than the third
Sum of the three angles less than six right angles and greater than two right angles

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

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

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