Surveying
In the prismatic compass

the magnetic needle moves with the box
the line of the sight does not move with the box
the magnetic needle and graduated circle do not move 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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Surveying
If the lower clamp screw is tightened and upper clamp screw is loosened, the theodolite may be rotated

on its inner spindle without a relative motion between the vernier and the graduated scale of lower plate
on its outer spindle without a relative motion between the vernier and gra-duated scale of lower plate
on its inner spindle with a relative motion between the vernier and the graduated scale of lower plate
on its outer spindle with a relative motion between the vernier and graduated scale of lower plate

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