The Archimedes' screw , sometimes wrongly called Endless screw, is a device that Archimedes would have developed at the time of a voyage in Egypt, allowing to the inhabitants of the edge the Nile to sprinkle their grounds.

Description

Although near to the Screw fastening by the name and appearance, its operating process the class in the family of the Propeller S.

Certain specific vehicles (on Snow and Sand, inter alia) are equipped with a system of propulsion using this type of screw, generally installed in pair, one turning in opposite direction of the other.

History

It is still used in many applications a little everywhere in the world, to move (generally while hoisting) liquids (pumping of subterranean water) or matters out of powder or grain (silos). The Greek mechanics indicate to us the use of a module to define various dimensions of the screw.

The diameter of the screw represents 1/16e of module, the step of the propeller 1/8e, the diameter of the cylinder envelope is equal to the step of the propeller. The slope of the unit must be 3 heights for 4 basic what represents the triangle pythagorician.

See too

• Screw with grain

• Stoker

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