plumb bob

noun
plummet ( def 1 ).

Origin:
1825–35

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
plumb bob
 
n
the weight, usually of lead, at the end of a plumb line; plummet

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
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.
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