Poncelet water wheel. 0:52 video:
https://www.youtube.com/watch?v=OPfjoAQxvcQ
Previously:
https://www.homemadetools.net/forum/...727#post163373
https://www.homemadetools.net/forum/...663#post159339
https://www.homemadetools.net/forum/...383#post158315
https://www.homemadetools.net/forum/...9816#post90060