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Text File  |  1992-09-01  |  236b  |  7 lines
  1. A simple instrument for finding horizontal
  2. level, used in surveying and building
  3. construction. It consists of a coloured
  4. liquid in a glass tube, in which a bubble is
  5. trapped. When the tube is horizontal, the
  6. bubble moves to the centre.
  7.