Segner water turbine: A - water inlet, B - vertical tube with rotor, C - rotor with nozzles (side view), D - rotor with nozzles ("top" view), E - hole in the ground, F - belt-pulley transmission, G - powered device
<a href="//commons.wikimedia.org/wiki/User:Zureks" title="User:Zureks">Zureks</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>