Two-part technical article on how worsted yarn is made, written by H. Beevers of Keighley Technical College. Part I follows top sliver through the drawing sets (Open, Cone, Porcupine, New Bradford and New Continental) to final roving, with machine diagrams and tables of doublings, drafts and sliver weights. Part II covers spinning roving into yarn on flyer, cap, ring and mule frames, drafting systems including high-draft and the Ambler Super Drafter, and plying of folded yarns.