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Bucket elevators, Persian wheels and Norias

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'''Improved Persian wheel, (Zawaffa or Jhallar)'''<br>

[[Image:modified persian wheel.jpg|thumb|right|~~250px~~200px|Zawaffa type Persian wheel, a modified version. (side wall shown partially removed). Drawing: FAO.]]

Traditional wooden Persian wheels were fitted with earthenware water containers, but a variety of all-metal improved Persian wheels have been built, some as commercial products, in China, India, Pakistan and Egypt. Metal Persian wheels can be made smaller in diameter, which reduces the extra height the water needs to be lifted before it is tipped out of the containers, and also reduces the well diameter that is necessary.

Winona

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