Hero demonstrating his aeolipile in front of the scholars of the school of Alexandria. An aeolipile aka aeolipyle, eolipile, or Heron's engine, is a simple bladeless radial steam turbine which spins when the central water container is heated. Hero of Alexandria, aka Heron of Alexandria; c. 10 AD – c. 70 AD. Greek mathematician and engineer. From Les Merveilles de la Science, published 1870.

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