Surveying
Accidental errors

All of these
Are generally small
Cannot be removed by applying corrections to the observed values
Do not follow any definite mathematical law

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Surveying
In the prismatic compass

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

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