High Quality Content by WIKIPEDIA articles! An aeolipile (or aeolipyle, or eolipile), also known as a Hero engine, is a rocket style jet engine which spins when heated. In the first century AD, Hero of Alexandria described the device, and many sources give him the credit for its invention. The aeolipile he described is considered to be the first recorded steam engine or reaction steam turbine. The name – derived from the Greek words "aeolos" and "pila" – translates to "the ball of Aeolus"; Aeolus being the Greek god of the wind. A device called an aeolipile was described in the 1st century BC by Vitruvius in his treatise De architectura; however, it is unclear whether it is the same device or a predecessor, as there is no mention of any rotating parts.

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