Surveying
In the prismatic compass

the magnetic needle moves with the box
the magnetic needle and graduated circle do not move with the box
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

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Surveying
Which of the following errors is not eliminated by the method of repetition of horizontal angle measurement ?

error due to wrong adjustment of line of collimation and trunnion axis
error due to displacement of station signals
error due to inaccurate graduation
error due to eccentricity of verniers

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