A dictionary entry on twill from Knight's American Mechanical Dictionary. It defines twill as a diagonal weave, discusses its etymology (drill, dimity, samite), and describes how twills of various intervals (blanket twill, satin) are produced and mounted on leaves of heddles. It includes a quotation from Ure on twilled cloths and a figure of four-leaved twilled weaving, and ends with a secondary sense of the word as a quill or spool.