Left: an aeolipile (right) shown connected or coupled to a weight (left) in the form of a heat engine, to demonstrate the heat conversion into work aspect of the mechanical equivalent of heat. Right: a modern laboratory scale aeolipile.
In engines, aeolipile, aka "ball of Aeolis", is a device in which steam contained in a boiler is release through oppositely facing orifices of a hinged bulb causing rotation of the bulb.

In 250BC, Greek compressed air engineer Ctesibius is attributed to have invented the steam spinning device; which is often assigned as being the world's first prototype steam engine:


These came to be known as the ‘aeolipile’ as described by both Roman architect Vitruvius (15BC) and Greek physicist Hero (50AD). [1] Owing to the fact that Hero was the first to give a detailed account on how to make an aeolipile, the device has since come to be known as Hero's engine or the aeolipile of Hero.

See also
Dipping bird

1. (a) Vitruvius. (15BC). On Architecture, Chapter VI (paragraph 2). Publisher.
(b) Hero. (date). Pneumatica (aeolipile). Alexandria: Publisher.
(c) Ctesibius – Wikipedia.

External links
Aeolipile – Wikipedia.

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