A short 1929 article by F. Schweiger on how to tell the right side (face) of a woven cloth from the back, especially for smooth fabrics that look much the same on both sides. It explains how yarn twist direction (single and doubled yarns) interacts with the direction of the twill line in twill and sateen weaves, and when a right- or left-hand twill gives the better face. Fourteen figures show twist diagrams, twill drawdowns and sateen weaves.