De Olifant, Burdaard Archimedes' screw. This Archimedes' screw has an axle diameter of and is diameter overall. It is inclined at an angle of 17½°. Each revolution of the screw lifts of water. The drive to the smaller of the two Archimedes' screws that drain the polder is from a 36 cog gear wheel meshing with the "great spur wheel". This drives a 33-cog gear wheel which drives the Archimedes' screw via a 41-cog gear wheel on the axle of the Archimedes' screw. This Archimedes' screw has an axle diameter of and is diameter overall. It is inclined at an angle of 121°.
Acorn Archimedes family omitted either the Acorn or Archimedes part of the name; the first models were named "BBC Archimedes", yet the name "Acorn Archimedes" is commonly used to describe any of Acorn's contemporary designs based on the same architecture. Archimedes machines are no longer sold, but computers such as the Raspberry Pi can still run its operating system, RISC OS (at least later versions), as they use ARM chips that are (mostly) compatible. The Acorn Archimedes was the first RISC-based home computer. The first models were released in June 1987, as the 300 and 400 series. The 400 series included four