Installment of Artur Hamann's series on fabric knowledge (Webwarenkunde), covering heavy technical fabrics: sailcloth (hemp, flax, cotton), tarpaulin (Presenning), Ravenstuch, bread-bag and knapsack fabrics, tent fabrics, and awning drills (Markisendrell, Umbradrell). It gives thread counts, yarn numbers, widths, weights, tear strengths, impregnation methods and stripe arrangements in tables. It also covers weave structures (plain weave, 2:1 and 3:1 twills, herringbone, double cloth with upper and lower warp and weft) and the lightfastness of dyes used for awning fabrics. Illustrated with photographs of samples (Abb. 137-143) and a warp cross-section.