Surveying
Cross staff is an instrument used for

setting out right angles
None of these
measuring bearings of the lines
measuring approximate horizontal angles

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Surveying
Bowditch rule is applied to

an open traverse for graphical adjustment
a closed traverse for adjustment of closing error
None of these
determine the effect of local attraction

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

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

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