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The screw pump is the oldest positive displacement pump. [1] The first records of a water screw, or screw pump, date back to Hellenistic Egypt before the 3rd century BC. [1] [3] The Egyptian screw, used to lift water from the Nile, was composed of tubes wound round a cylinder; as the entire unit rotates, water is lifted within the spiral tube to the higher elevation.
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A screw turbine at a small hydro power plant in Goryn, Poland. The Archimedean screw is an ancient invention, attributed to Archimedes of Syracuse (287–212 BC.), and commonly used to raise water from a watercourse for irrigation purposes.
An Archimedes' screw in Huseby south of Växjö Sweden: Archimedes' screw: Roman screw used to dewater mines in Spain: Modern Archimedes' screws which have replaced some of the windmills used to drain the polders at Kinderdijk in the Netherlands: Archimedes' screw as a form of art by Tony Cragg at 's-Hertogenbosch in the Netherlands
Three principal forms exist; In its simplest form (the Archimedes' screw pump or 'water screw'), a single screw rotates in a cylindrical cavity, thereby gravitationally trapping some material on top of a section of the screw as if it was a scoop, and progressively moving the material along the screw's axle until it is discharged at the top.
Archimedes’ death ray is more commonly speculated to have been an array of several mirrors or polished shields. However, this theory is often discredited due to the idea that ships would be ...
The idea of a simple machine originated with the Greek philosopher Archimedes around the 3rd century BC, who studied the Archimedean simple machines: lever, pulley, and screw. [2] [13] He discovered the principle of mechanical advantage in the lever. [14]
The description of this crane was recorded in the Library of Alexandria, and subsequent engineers would draw upon Archimedes' ideas until the first technical drawings of a worm drive were developed by Leonardo da Vinci; [6] the design was limited by the fact that metallic gears had not been invented by the advent of the 15th century, and the ...