Surveying
In the prismatic compass

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

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Surveying
The error due to eccentricity of inner and outer axes can be eliminated by

taking both face observations and taking the mean of the two
double sighting
taking mean of several readings distributed over different portions of the graduated circle
reading both verniers and taking the mean of the two

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Surveying
The meridian of a place is

A semi-circle which passes through the place and is terminated at the poles
A great circle passing through the place and the poles
An arc of the great circle which passes through the place and is perpendicular to the equator
A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place

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