Folio 13 from the Osma Gallinger Tod Studio gives instructions for weaving Flossa (Scandinavian knotted pile) rugs. It compares Flossa with Rya and Half-flossa, and covers materials, planning designs on square-ruled paper, and the step-by-step knotting technique with a gauge bar. The steps include binding rows with tabby, cutting the pile, weaving wool triangles into the selvage, and clipping the surface, with substitute equipment suggested. The final page shows four Flossa rug designs, and diagrams illustrate the knotting steps.