A 1931 trade article by John Piconi on the problems of weaving mixed rayon and silk fabrics on power looms. It covers the importance of up-to-date looms, yarn twist, and setting the warp line so top and bottom sheds are equidistant, and it checks harness springs for uniform stretch. It also discusses the different elasticity of rayon and silk warps, shuttle and filling tension problems, feeler motions, and a recommended loom speed. Two cross-section loom diagrams contrast correct and incorrect harness settings.