Tom blok Photo collection by Th.Schiöler Spiral scoops, screws and the chain pump The Archimedean screw Photo 152
The Archimedean screw
Gul streg
Photo 511 x 506 pixels, 43,6 K
 
Fresco in Pompeii
In the relevant literature, it has long been accepted that this fresco depicts an Archimedean screw. Unfortunately, the screw is not inclined at about thirty degrees as it must be to lift any water. We know that the Archimedean screw was turned by one or two treading men; but why not by means of a crank? Because the steel crank was yet not invented.
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