A Plumb Bob is a weight usually with a pointed tip on the bottom, suspended from a string and used as a vertical reference line, or a plumb-line. It is a precursor to the spirit level and used to establish a vertical or horizontal datum. The word “plumb” comes from the fact that such tools were initially made of lead, lead in Latin is plumbum, and in French it is plomb. This device was used well into the modern age for most tall structures to provide vertical datum lines for the building measurements. A section of the scaffolding would hold a plumb line, which was centred over a datum mark on the floor. As the building proceeded upward, the plumb line would also be taken higher, still centred on the datum. Many cathedral spires domes and towers still have brass datum marks inlaid into their floors, which signify the center of the structure above. This tool can also be used as an inclinometer to measure angles to the vertical.
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