These are two rare brass antique plumb bobs with original string. Tips intact.

One is 10oz- 12.5cm diameter, 10.5cm length

The other is 11oz - 12.5cm diameter and 8.5cm length

Also called a plummet, a plumb bob is a very simple device. It consists of a small weight with a pointed bottom that is attached to the bottom of a piece of string. The string is usually made from either cotton or nylon, and the weight is typically made from brass or steel.

When the weight is allowed to dangle, it pulls the string into a vertical line that is referred to as a plumb line. The plumb bob gives architects and builders a vertical reference point during construction. It can be used for all kinds of construction projects, from building a bridge to hanging art on the walls.

Most historians agree that the first plumb bob was invented in Egyptian times. Used for architecture, sailing, and surveying the skies, the device likely played a major role in constructing the pyramids. The weight was usually made from a rock or some other kind of heavy object. It was installed inside a frame that allowed it to turn horizontally and vertically: acting as both a level and a plumb bob.