Search results
Results from the WOW.Com Content Network
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.
Download as PDF; Printable version; ... Archimedes' screw; ASTM A325; ASTM A354; ASTM A490; ... List of screw and bolt types; List of screw drives; M.
Water flows freely off the end of the screw into the river. The upper end of the screw is connected to a generator through a gearbox. The Archimedes screw is theoretically a reversible hydraulic machine, and there are examples of single installations where screws can be used alternately as pumps and generators.
Archimedes Screw Pump. One of the US's oldest surviving examples of the wind-driven Archimedes screw-pump. 1890 Newark: California United States ASME brochure: 92: 1984 Stanford Linear Accelerator Center. Unique electromechanical devices and systems in the longest accelerator in the world. 1962 Menlo Park: California United States ASME brochure ...
Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Help; Learn to edit; Community portal; Recent changes; Upload file
The first type of screw conveyor was the Archimedes' screw, used since ancient times to pump irrigation water. [1] They usually consist of a trough or tube containing either a spiral blade coiled around a shaft, driven at one end and held at the other, or a "shaftless spiral", driven at one end and free at the other. The rate of volume transfer ...
Roman screw used to dewater mines in Spain Another device which was used widely was the Archimedean screw , and examples of such drainage machines have also been found in many old mines. Depictions show the screws being powered by a human treading on the outer casing to turn the entire apparatus as one piece.
The principle of moving water with a screw has been known since the invention of the Archimedes' screw, named after Archimedes of Syracuse who lived in the 3rd century BC. It was not until the 18th century however, and the invention of the steam engine , that a practical means of delivering effective power to a marine screw propulsion system ...