Which feature of a plane table is used to centre the table over a ground station?
Correct answer: A. Plumbing fork
- A. Plumbing fork
- B. Alidade
- C. Trough compass
- D. Drawing sheet clamp
Explanation
A plumbing fork, used with a plumb bob, transfers the ground station point to or from the corresponding point on the drawing sheet. An alidade is used for sighting, while a trough compass provides approximate orientation.
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