A technical article by Dr. Fr. Stein analysing the mechanics of plain weave cloth formation on the loom. It uses force diagrams and the "weave angle" to explain warp and weft tensions, warp contraction, the return of picks after beating up, the final weave angle and pick density, and the forecloth limit. It also treats reed marks, the effect of lease rod rocking on warp spacing, and post-loom shrinkage, crepe effects and curling compared with sateen.