![]() ![]() The average modern day plumb bob is made of metal, usually brass or steel, and weighs roughly one pound. The Ancient Greeks and Romans also used plumb bobs to level and measure. The invention of the plumb bob dates back to the Egyptians in 2700 B. Today, plumb bobs are widely used in the construction and building industry, and come in sizes ranging from a few centimetres for smaller tasks to a metre or more for large projects. In the past, it has been used in many fields, including astronomy and engineering, and can also be used to verify the alignment of a camera lens or telescope. It is typically used to set up a perpendicular reference line from a given point, so it could be used to precisely measure height, measure straightness or level, find the convergence of walls and corners, and is a key tool for surveyors and masons alike. The traditional shape of the weight was a metal ball, usually with a pointed end, although weights in the shape of discs, diamonds and cones were also used. It consists of a weight attached to a cord, which when suspended from a fixed point, hangs directly beneath the fixed point. ![]() The plumb bob is a simple gravity device used to establish a vertical reference point, and modern versions of the tool are just an improvement on the original design. It is one of the oldest surveying tools still used today. The plumb bob was likely invented by the ancient Egyptians in around 1800 BC, though its exact origin is unknown. ![]()
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