Surveying
The following sights are taken on a “turning point”

foresight and backsight
foresight only
foresight and intermediate sight
foresight only

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Surveying
A ’level line’ is a

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

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Surveying
Theodolite is an instrument used for

measurement of horizontal angles only
tightening the capstan-headed nuts of level tube
measurement of vertical angles only
measurement of both horizontal and vertical angles

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