Aeolipile steam engine - GIF

Aeolipile steam engine.

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Previously:

1883 torpedo boat steam engine running - video
River Don steam engine - photo and video
Titanic's steam engine - photo

With the rotation axis horizontal as shown the risk is that hot water will be ejected from the jets in addition to the steam. Making the rotation axis vertical avoids that.

If you want to build your own, a copper toilet float is a good place to start, as shown here...

https://www.homemadetools.net/forum/...7364#post36925