Genezareth, Hallum of the "upright shaft", a "crown wheel" with 35 cogs drives a gear with 35 cogs on the axle of the Archimedes' screw. The axle of the Archimedes' screw is 340 millimetres (13¼ in) diameter. The Archimedes' screw is diameter and long. It is inclined at an angle of 17½°. Each revolution of the Archimedes' screw lifts of water. The "Genezareth" is open to the public by appointment, or if it is working. Genezareth, Hallum The Genezareth or Kloosterpoldermolen is a smock mill in Hallum, Friesland, Netherlands which was built in 1850 and has been restored to working order. The
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".