Gerolamo Cardano
![17th-century portrait [[engraving]] of Cardano](https://upload.wikimedia.org/wikipedia/commons/2/2f/Girolamo_Cardano._Stipple_engraving_by_R._Cooper._Wellcome_V0001004.jpg)
Cardano partially invented and described several mechanical devices including the combination lock, the gimbal consisting of three concentric rings allowing a supported compass or gyroscope to rotate freely, and the Cardan shaft with universal joints, which allows the transmission of rotary motion at various angles and is used in vehicles to this day. He made significant contributions to hypocycloids - published in ''De proportionibus'', in 1570. The generating circles of these hypocycloids, later named "Cardano circles" or "cardanic circles", were used for the construction of the first high-speed printing presses.
Today, Cardano is well known for his achievements in algebra. In his 1545 book ''Ars Magna'' he made the first systematic use of negative numbers in Europe, published (with attribution) the solutions of other mathematicians for cubic and quartic equations, and acknowledged the existence of imaginary numbers. Provided by Wikipedia
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1by Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576
Published 2013
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2by Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576
Published 2019
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3by Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576
Published 2021
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4by Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576
Published 1969
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5by Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576
Published 2014
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6by Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576
Published 2009
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7by Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576
Published 1930
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8by Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576
Published 1968
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9by Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576
Published 1973
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10by Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576, Cardano, Girolamo, 1501-1576
Published 2004
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