Surveying
For accurate work, the steel band should always be used in preference to chain because the steel band

is practically inextensible and is not liable to kinks when in use
can be easily repaired in the field
is lighter than chain
is easier to handle

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Surveying
A ’level line’ is a

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

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