Encyclopedia entry (pp. 292-293) describing an early 19th-century yarn mill, a water- or horse-driven machine for preparing and spinning hemp, tow, flax and wool. It explains the cylinder, pressing and drawing rollers, revolving cloth, canister and contractor that form the sliver, the successive drawing machines, and the spinning machine with its spindles. An engraved plate (CCCXVIII) shows the yarn mill parts, Mr Harman's machine for dressing woollen cloth, and wool-combing apparatus.