An article from Posselt's Textile Journal (March 1916) explaining how 80-degree diagonal weaves are derived from regular twills by taking every fifth warp thread of the foundation twill. It works through examples based on a 30-harness regular twill, giving repeats of 6, 7, 8, 9 and 10 warp threads, and shows twenty weave diagrams (Figs. 1-20). The scan also includes a column on starch modification for sizing and a list of formulas for drawing frames.