Surveying
Size of a theodolite is specified by

the diameter of lower plate
the diameter of vertical circle
the diameter of upper plate
the length of telescope

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Surveying
In the prismatic compass

the magnetic needle and graduated circle do not move with the box
the line of the sight does 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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