A self-reading levelling staff is normally graduated so that its readings are taken from the:
Correct answer: B. Foot of the staff upward
- A. Top of the staff downward
- B. Foot of the staff upward
- C. Line of sight upward
- D. Centre of the bubble outward
Explanation
A levelling staff is graduated from its bottom, and the staff reading increases upward from the point on which it stands. This convention allows the height of instrument method to be applied consistently.
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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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