Tom blok Photo collection by Th.Schiöler Spiral scoops, screws and the chain pump The "liberation" pump in China Photo 160
The "liberation" pump in China
Gul streg
Photo 511 x 506 pixels, 43,6 K
 
The "liberation" pump in China
The draught animal must be an ox if the water-lift is more than ten metres.
[160] FAO photo