Surveying
A ’level line’ is a

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
line passing through the objective lens and the eye-piece of a dumpy or tilting level

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Surveying
The length of a chain is measured from

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

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