dumpy level

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A surveyor's instrument having a short telescope fixed rigidly to a horizontally rotating table.

from the GNU version of the Collaborative International Dictionary of English.

• (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 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a surveyor's level having a short telescope fixed to a horizontally rotating table and a spirit level