Aeolipile

Simple, bladeless radial steam turbine

An aeolipile, aeolipyle, or eolipile, from the Greek "Αἰόλου πύλη," lit. 'Aeolus gate', also known as a Hero's engine, is a simple, bladeless radial steam turbine which spins when the central water container is heated. Torque is produced by steam jets exiting the turbine. The Greek-Egyptian mathematician and engineer Hero of Alexandria described the device in the 1st century AD, and many sources give him the credit for its invention. However, Vitruvius was the first to describe this appliance in his De architectura.

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