Graphical Construction Glossary >> General construction, Woodwork. >> Hand Tools >> Plumb Bob
Above is a two thousand years old Roman plumb-bob in the British Museum.
Alongside is sketch of a plumb rule.
The plummet needs a line that it is suspended from and it creates a true vertical reference line. It can also be used to find a point directly below the point that it is suspended from.
See here for more on using plummets and string lines.
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"When we build, let us think that we build for ever."John Ruskin 1819-1900
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