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Charpentiers d'Europe et d'ailleurs
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Plumb-bobs

Three carpenter's plumb-bobs Plumb-bob, 15th century

The plumb-bob with a hole in its centre is a standard tool for French carpenters, who use it when aligning beams to the
ground plan. The central hole allows the user to line up by eye the plumb line – and thus the bob itself – with the main points of a life-size drawing sketched on the ground. This meant that the line of the beams can be made to square with the image of the structure as depicted in the ground plan.
For a long time, plumb-bobs, which were often made by hand, have had a scalloped or toothed rosace shape. This fact was mentioned in Mathurin Jousse's L'Art de charpenterie (1702), but it probably can be compared with much older shapes.

Associated media

 
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medias
Muidorge (France)
Muidorge (France)