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

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

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Surveying
Pick up the correct statement for horizontal photographs.

All listed here
The two sides of a road meet at the vanishing point
The lines parallel to the negative plane are projected as parallel lines
Parallel lines do not appear parallel in central projection

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Surveying
The prismatic compass and surveyor’s compass

both give WCB of a line
give whole circle bearing (WCB) of a line and quadrantal bearing (QB) of a line respectively
both give QB of a line
both give QB of a line and WCB of a line

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