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* a horizontal wheel with a vertical axle; or
* a vertical wheel with a horizontal axle.
The latter can be subdivided according to where the water hits the wheel into backshot (pitch-back<ref>[https://web.archive.org/web/20170815063910/https://en.oxforddictionaries.com/definition/pitch-back
The term undershot can refer to any wheel where the water passes under the wheel<ref>[https://www.collinsdictionary.com/dictionary/english/undershot Collins English Dictionary]</ref> but it usually implies that the water entry is low on the wheel.
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