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plumb bob

plummet (def 1).
Origin of plumb bob
1825-35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for plumb bob
Historical Examples
  • The plumb bob is then dropped, a distance of 20 ft. measured from it on the road, and a mark made.

  • A plumb bob must be attached exactly in the center of the tripod head.

  • When the instrument was level atop these rings, the plumb bob was theoretically over the center line of the cannon.

  • Our surveying apparatus was a triangle and a plumb bob which we made ourselves.

    Then and Now Robert Vaughn
  • He thought that a plumb bob dropped through the long axis of the rocket would form a right angle with the surface of Arzachel.

    First on the Moon Jeff Sutton
  • He had a plumb bob in his hand and a spirit level, but he laid them down.

    The "Genius" Theodore Dreiser
  • A protractor may be used in the same manner by sighting along the top and using a plumb bob to record the angle.

    Military Instructors Manual James P. Cole and Oliver Schoonmaker
British Dictionary definitions for plumb bob

plumb bob

the weight, usually of lead, at the end of a plumb line; plummet
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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