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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Dump·y lev·el. Surv. A level having a short telescope (hence its name) rigidly fixed to a table capable only of rotatory movement in a horizontal plane. The telescope is usually an inverting one. It is sometimes called the {Troughton level}, from the name of the inventor, and a variety improved by one Gavatt is known as the {Gavatt level}.
 

From: WordNet (r) 2.0

 Dumpy level
      n : a surveyor's level having a short telescope fixed to a
          horizontally rotating table and a spirit level