Surveying
Which of the following is not the function of levelling head ?

to attach the theodolite to the tripod
to provide a means for leveling the theodolite
to support the main part of the instrument
None of these

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Surveying
A ’level line’ is a

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

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