- A prime mover in which a central wheel with curved vanes, enclosed in a chamber, receives water directed onto the curved vanes by a ring of fixed guide vanes, causing the wheel to rotate about its axis.
- English Heritage
- http://creativecommons.org/licenses/by/3.0 (FISH Thesaurus of Monument Types)
- http://www.english-heritage.org.uk (FISH Thesaurus of Monument Types)
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