![]() While an end-weighted string defines the vertical, its direct use for plumbing walls (making them vertical) is clumsy. So, where did the plumb bob method originate, and how long ago was it being used? Well, you might be surprised to know that, in actual fact, the method of plumb bobbing can be traced all the way back to ancient Egypt.Īccording to the Brittanica Dictionary, “the plumb bob is a light line with a weight (plumb bob) at one end that defines a vertical line when suspended next to a workpiece.” Plumb is derived from the Latin plumbum, or “lead,” the material that substituted stone as the weight for the bob or plummet.
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