What do a.m. and p.m. stand for?

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
  • The plumb bob accurately transfers measured points above the ground to comparable points on the ground.
  • The quadrant consisted of a triangular plate, the point of which was fitted with a plumb bob.
  • Verifies vertical and horizontal alignment of members using plumb bob and level.
  • The deflection of the vertical is the departure of a plumb bob's actual pointing from the ellipsoidal normal direction.
  • Utilize plumb bob, gauge line and spirit level to obtain straight courses.
  • Tilt was first measured by the movement of a suspended plumb bob.
  • Verifies vertical alignment of posts with plumb bob or spirit level.
  • The plumb bob is deployed from the helicopter to the surface being measured.
  • Bore, drill, or auger the borehole as close to vertical as possible and check with a plumb bob or level.
  • Welds brackets to support rails and framework and verifies alignment with plumb bob and level.
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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