Surveying
Refraction correction

adds to the curvature correction
has no effect on curvature correction
completely eliminates curvature correction
partially eliminates curvature correction

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Surveying
The length of a chain is measured from

centre of one handle to centre of other handle
outside of one handle to inside of other handle
inside of one handle to inside of other handle
outside of one handle to outside of other handle

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Surveying
A ’level line’ is a

line passing through the objective lens and the eye-piece of a dumpy or tilting level
horizontal line
line passing through the center of cross hairs and the center of eye piece
line parallel to the mean spheriodal surface of earth

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