A one-page dictionary entry on James Hargreaves' spinning-jenny of 1767, from Knight's American Mechanical Dictionary. It explains how hand spinning limited cotton yarn supply, how Hargreaves developed the machine with vertical spindles and a movable wooden clasp, and how the name 'jenny' arose. It also notes Arkwright's later spinning-frame for warp yarn and Hargreaves' later career and patent troubles. Includes an engraving of the machine (Fig. 5411).