Between 1839 and 1853 the French mathematician Théodore Olivier created string models to teach and demonstrate descriptive geometry, some of which could be manipulated. He was a student of French mathematician Gaspard Monge, who invented descriptive geometry and was already illustrating his ideas with rudimentary string models. Photo above: intersection of two cylinders. Sources: Nicholas Mee (2013) Strings, Surfaces and Physics. Photo above taken in the […]

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**Pierre Dragicevic**. Category:**Physical model**. Tags: geometry, mathematics, mechanical interaction, teaching