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Archimedes Screw
WRITTEN BY: The Editors of Encyclopaedia Britannica
Archimedes screw, machine for
raising water, allegedly invented by the ancient Greek scientist Archimedes for
removing water from the hold of a large ship.
One form consists of a circular pipe enclosing a helix and
inclined at an angle of about 45 degrees to the horizontal with its lower end
dipped in the water; rotation of the device causes the water to rise in the
pipe.
Other forms consist of a helix revolving in a fixed cylinder
or a helical tube wound around a shaft.
Modern screw pumps, consisting of
helices rotating in open inclined troughs, are effective for pumping sewage in
wastewater treatment plants.
The open troughs and the design of the screws permit the
passage of debris without clogging.
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