Tom blok Photo collection by Th.Schiöler Spiral scoops, screws and the chain pump The "liberation" pump in China Photo 159
The "liberation" pump in China
Gul streg
Photo 511 x 506 pixels, 43,6 K
 
The "liberation" pump with a crank
One or two men can replace the donkey but if so the capacity is for small-scale irrigation only.
[159] FAO photo.