New York , NY
Watermill Reversed Archimedean Screw
Photograph - Photograph
A historical illustration of a watermill with reversed Archimedean screw, c 1629, from Branca's Le Machine. Archimedes' screw (also called an Archimedes screw, an Archimedean screw or a screwpump) is a device invented by Archimedes in the 3rd century BC to transfer water from a lower level into higher irrigation ditches.
February 19th, 2013
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