Surveying
Normal tension is that pull which

makes the correction due to sag equal to zero
neutralizes the effect due to pull and sag
makes the correction due to pull equal to zero
is used at the time of standardising the tape

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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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