What is the principal purpose of centring a theodolite during its temporary adjustment?
Correct answer: B. To place the instrument over the survey station
- A. To make the vertical axis exactly vertical
- B. To place the instrument over the survey station
- C. To remove error of eccentricity permanently
- D. To set the telescope line perpendicular to the horizontal axis
Explanation
Centring places the vertical axis of the theodolite directly over the ground station. Levelling makes the vertical axis truly vertical, while collimation and other permanent conditions are dealt with separately.
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About Surveying
Surveying covers measurement of distances, angles and elevations, traversing, levelling, contouring, plane table work, theodolites, total stations and basic photogrammetry. It includes error adjustment, coordinate calculations, area and volume determination, and the distinction between accuracy and precision, as well as between temporary and permanent adjustments.
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