Using a plumb bob4/27/2023 ![]() Copyright Mayo Foundation, Rochester, MN. Taken with permission of the Mayo Foundation, copyright 2018. The vertical (A) and horizontal (B) plumb line tools. FIGURE 1:Īncient Egyptian use of the plumb line. This simple tool consistently and accurately defined horizontal and vertical planes and allowed for the complex construction of buildings, canals, and pyramids, which have endured for centuries. If the plumb line bisected the crossbar of the “A,” it was horizontal. The plumb line was attached to the tip of an “A” frame, and the legs of the “A” were placed on a surface ( Fig. The backbone of the “F” was placed against a wall, and the wall was determined to be perfectly vertical, when the plumb line touched the middle outerboard part of the middle of the “F.” The Egyptians also used the plumb line to determine perfect horizontal reference lines as well. ![]() 1 The tool was in the shape of an “F,” with the plumb line suspended, from the upper outboard part of the F ( Fig. The reproducible and constant vertical reference line created by this construct is known as the “plumb line.” It is called a “plumb” line after the lead weight (Latin for lead is “plumbum”) from which the line was historically suspended.Įarly use of the plumb line was recorded nearly 4000 years ago during ancient Egyptian times. In modern times, the lead was replaced by a brass conical cylinder with a point at the bottom. The suspended weight in ancient times was probably a stone and was replaced by lead in medieval times, as it was dense, heavy, and resisted movement from the wind. ![]() A plumb line is a vertical line that is created from a string that has a suspended weight.
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