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For holes deeper than three feet, drop a plumb bob (a conical weight attached to a string) into it to give you some sense whether the hole itself is plumb and uniformly shaped.—
Ryan D'agostino,
Popular Mechanics,
24 Oct. 2020 The plumb bob will hang at the angle reading for your latitude.—
Rhett Allain,
WIRED,
3 May 2018 Cake pans, coffee pots, cash registers, and a white ElectroChef stove appeared amid scientific instruments such as steel calipers and a brass plumb bob.—
Jason Farago,
New York Times,
7 Sep. 2017