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Plumb bob
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a weight attached to a string or line used by plumbers and builders to establish vertical alignment and ensure accuracy in construction
What is a "plumb bob"?
A plumb bob is a simple tool used to find a vertical reference line, ensuring that surfaces or structures are perfectly upright. It consists of a weight, usually made of metal, attached to a string or cord. When the plumb bob is suspended from a point and allowed to hang freely, it will align itself with gravity, pointing directly downward. This helps measure or check for vertical alignment in construction, carpentry, and other projects, such as ensuring walls or posts are perfectly straight.
Example
ChatGPT The construction worker used a plumb bob to ensure the wall was perfectly straight.
The mason relied on a plumb bob to align the bricks accurately during the build.
The carpenter attached a plumb bob to the ceiling to measure the height of the walls.
