Archimedes' screw rivers, including the Thames, powering Windsor Castle. In 2017, the first reverse screw hydropower in the United States opened in Meriden, Connecticut. The Meriden project was built and is operated by New England Hydropower having a nameplate capacity of 193 kW and a capacity factor of approximately 55% over a 5-year running period. Archimedes' screw An Archimedes' screw, also known by the name the Archimedean screw or screw pump, is a machine used for transferring water from a low-lying body of water into irrigation ditches. Water is pumped by turning a screw-shaped surface inside a pipe. The screw pump is
Archimedes' quadruplets Archimedes' quadruplets In geometry, Archimedes' quadruplets are four congruent circles associated with an arbelos. Introduced by Frank Power in the summer of 1998, each have the same area as Archimedes' twin circles, making them Archimedean circles. An arbelos is formed from three collinear points "A", "B", and "C", by the three semicircles with diameters "AB", "AC", and "BC". Let the two smaller circles have radii "r" and "r", from which it follows that the larger semicircle has radius "r" = "r"+"r". Let the points "D" and "E" be the center and midpoint, respectively, of the semicircle with the radius "r".