Hero of Alexandria
(c. ad 62) Greek mathematician and inventor
Hero produced several written works on geometry, giving formulae for the areas and volumes of polygons and conics. His formula for the area of a triangle was contained in Metrica(Measurement), a work that was lost until 1896. This book also describes a method for finding the square root of a number, a method now used in computers, but known to the Babylonians in 2000 bc. In another of Hero's books, Pneumatica (Pneumatics), he wrote on siphons, a coin-operated machine, and the aeolipile – a prototype steam-powered engine that he had built. The engine consisted of a globe with two nozzles positioned so that steam jets from the inside made it turn on its axis. Hero also wrote on land-surveying and he designed war engines based on the ideas of Ctesibius. Yet another of his works, Mechanica (Mechanics), was quoted by Pappus of Alexandria.

Scientists. . 2011.

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  • Hero of Alexandria — noun Greek mathematician and inventor who devised a way to determine the area of a triangle and who described various mechanical devices (first century) • Syn: ↑Hero, ↑Heron • Instance Hypernyms: ↑mathematician, ↑inventor, ↑discoverer, ↑artificer …   Useful english dictionary

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  • Ctesibius of Alexandria — or Ktesibios of Alexandria flourished с 270 BC Greek physicist and inventor. He was the first great figure of the ancient engineering tradition of Alexandria, Egypt, which culminated with Heron of Alexandria and Philo of Byzantium. He discovered… …   Universalium

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  • Hero — /hear oh/, n. 1. Class. Myth. a priestess of Aphrodite who drowned herself after her lover Leander drowned while swimming the Hellespont to visit her. 2. Also, Heron. (Hero of Alexandria) fl. 1st century A.D., Greek scientist. * * * I… …   Universalium

  • Hero (disambiguation) — A hero is a person who performs extraordinary deeds for the benefit of others.Hero may also refer to:Heroic figures* Superhero, a hero with extraordinary powers * Hero (title), a title presented by governments to their citizens for great… …   Wikipedia

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