Surveying
Cross staff is an instrument used for

measuring bearings of the lines
setting out right angles
None of these
measuring approximate horizontal angles

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Surveying
In the prismatic compass

the line of the sight does not move with the box
the magnetic needle and graduated circle do not move with the box
the magnetic needle moves with the box
the graduated circle is fixed to the box and the magnetic needle always remains in the N-S direction

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