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HERON'S AEOLOSHERE

Heron describes the construction of a sphere that was made to move by the power of steam. The principle was very simple, a large sealed cauldron of water was placed over a source of heat. As the water boiled, the steam generated rose into two pipes, between which was hung a sphere. Jets of steam escaped from the sphere through two L-shaped outlets, causing it to spin. It is just like a modern steam engine.