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Created byJustin Roche
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[1622] The slide rule is invented by William Oughtred.[1642] Blaise Pascal invents the mechanical calculator.[1673] Gottfried Leibniz invents the Leibniz wheel.[1730] John Hadley invents the octant.[1698] Thomas Savery patents the steam engine.[1608] Hans Lippershey patents the refracting telescope.[1666] Isaac Newton argues that the refracting telescope is too inaccurate.[1718] John Hadley improves the precision of the reflecting telescope.[1643] Evangelista Torricelli is credited with inventing the barometer.[1585] Simon Stevin proposes the use of decimals in mathematics.
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