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plumb bob

plummet (def 1).
Origin of plumb bob
First recorded in 1825-35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for plumb bob
Historical Examples
  • A plumb bob must be attached exactly in the center of the tripod head.

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

    Then and Now Robert Vaughn
  • He had a plumb bob in his hand and a spirit level, but he laid them down.

    The "Genius" Theodore Dreiser
  • When the instrument was level atop these rings, the plumb bob was theoretically over the center line of the cannon.

  • 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
  • The plumb bob is then dropped, a distance of 20 ft. measured from it on the road, and a mark made.

  • 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
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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