If the plane table is not horizontal in a direction at right angles to the alidade, the line of sight is parallel to the fiducial edge only for

Question: If the plane table is not horizontal in a direction at right angles to the alidade, the line of sight is parallel to the fiducial edge only for

1.horizontal sights

2. inclined sights upward

3. inclined sight downward

4.none of these.


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