Online Exhibits > Leonardo and the Engineers of the Renaissance > Models

Pressure-resistant ball bearing

Dimensions: 31x58 cm
Materials: durmast, plexiglas, metal
Constructor: Muséo Techni, Montréal
Date: 1987

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Working model after Leonardo da Vinci, Madrid Ms. I (BNM), fol. 20v

Eight concave-sided spindles rotating on their own axes prevent lateral movements by the balls, which, however, can rotate freely. The sphere-and-spindle system reduces friction, allowing the top platform to turn easily even when carrying a heavy load.

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