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
SS Archimedes a six-bladed "windmill" propeller designed by himself. Brunel's design was to prove a costly failure for the company. Smith and his fellow investors had originally hoped to sell "Archimedes" to the Royal Navy, but when this did not eventuate, the Ship Propeller Company sold the vessel into commercial service. The company, which is estimated to have lost a total of about £50,000 on the "Archimedes" venture, was subsequently wound up. The later career of "Archimedes" is sketchy. The ship ran aground at Beachy Head in 1840. In 1845, she disappeared from Lloyd's Register, but appeared again in 1847 following an