A 1794 article from The Repertory of Arts and Manufactures describing Hugh Hughes's machine for twitching (opening and loosening) wool, a task formerly done by hand with rods or in gigging mills. It includes extracts from two letters by Hughes, mention of certificates from users, and a lettered description of the crank, gear and flier mechanism, which can be driven by hand, horse, water or wind. An engraved plate shows the machine.