What is a plumb bob used for?

A plumb bob is a tool used in construction and carpentry to establish a vertical reference line. It consists of a weight, typically made of metal, attached to a string or line. The weight is suspended from a fixed point, allowing it to hang freely and align with the force of gravity to find the vertical line.

Plumb bobs are commonly used to ensure that walls are perfectly vertical, to align posts and columns during construction, and to check the accuracy of measurements and angles. They are also used in surveying, plumbing, and other trades where precise vertical alignment is necessary.

Plumb bobs come in various sizes and weights, depending on the specific application. Some plumb bobs have a pointed tip to easily mark the exact position on a surface, while others may have a flat or rounded shape. They are a simple yet essential tool for achieving accuracy and precision in various construction and building projects.