Pump bob

Description

A plumb bob is a tool used in construction to establish a true vertical line, known as a plumb line, by using the force of gravity. It consists of a weight, usually with a pointed tip, suspended from a string or line. When the weight hangs freely, gravity pulls it downward, creating a vertical reference line. This tool is particularly useful in construction for ensuring that walls, columns, and other vertical structures are perfectly aligned and level. Plumb bobs are simple yet powerful tools that have been used in construction for centuries and are still trusted today for their accuracy and reliability.