Surveying
The slotted template method

All listed here
Is rapid and accurate
Is suitable for large areas with less control
Is prepared, by graphical method

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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 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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