A short dictionary entry on the wool-cleaner, a machine that removes dust, burs and other foreign matter from wool before carding. It describes how the wool passes from the feed-box over aprons, toothed cylinders and beaters to pressure rolls, and is then coiled on a cylinder with a cloth between the layers. It also mentions solvent cleaning with petroleum or carbon sulphide and cites an 1868 patent. An engraved elevation of the machine (Fig. 7845) accompanies the entry.