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it is a spirit level.
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Dumpy level provides a horizontal line (parallel to earth's curvature); you can read the scale by holding it normal to the ground level. Take separate readings for separate points
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Answers.com > Wiki Answers > Categories > Travel > How can you use dumpy level for machine Erection?
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n. A surveyor's instrument having a short telescope fixed rigidly to a horizontally rotating table.
http://www.answers.com/topic/dumpy-level
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