Surveying
In the prismatic compass

the graduated circle is fixed to the box and the magnetic needle always remains in the N-S direction
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

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Surveying
Theodolite is an instrument used for

tightening the capstan-headed nuts of level tube
measurement of both horizontal and vertical angles
measurement of vertical angles only
measurement of horizontal angles only

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