KW258408 Robert\'s Self-Acting Mule, c.1830 (litho) by Lowry, Joseph Wilson (1803-79); Private Collection; (add.info.: machine used in factories, for spinning cotton or wool, into yarn or thread and winding it into cops; also called a Jenny; revolutionized the factory system as it allowed unskilled workers to operate machinery; invented by Richard Roberts (1789-1864);); British, out of copyright.