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 coordinates of this range is 25.3° N, 4.6° W. The peaks of Montes Archimedes occupy an area with a maximum diameter of 163 km, although the most rugged portion of the terrain is concentrated within the central 70 km. The remainder of the peaks are scattered across the plateau, with no particular structure or pattern. Some of the peaks in this range achieve heights of up to 2.0 km, much less than those in the Montes Apenninus, for example, and none have received specific designations. Montes Archimedes Montes Archimedes is a mountain range on the Moon. It is named after