De Westermolen, Kollumerpomp of the upright shaft. At the bottom of the upright shaft is the "crown wheel", which has 41 cogs, drives a gearwheel with 42 cogs on the axle of the Archimedes' screw. The axle of the Archimedes' screw is diameter. The screw is diameter . It is inclined at 16.7°. Each revolution of the screw lifts of water. The Archimedes' screw that pumped water into the polder has been removed. "De Westermolen" is open on Friday mornings. It is also open on Saturday mornings if there is enough wind to work the mill. De Westermolen, Kollumerpomp De Westermolen is a
Montes Archimedes Montes Archimedes Montes Archimedes is a mountain range on the Moon. It is named after the crater Archimedes that lies to the north, which in turn is an eponym of the Greek mathematician Archimedes. This group of mountains is located on a plateau in the eastern part of the Mare Imbrium, a lunar mare in the northwest quadrant of the Moon's near side. They are bounded on the eastern side by the Palus Putredinis, a small mare, and to the north by Archimedes. Farther to the south and east lies the impressive Montes Apenninus, a long mountain range. The selenographic