A continuation of E. A. Posselt's series on reversible fabrics for harness and Jacquard weaving, covering three-ply reversibles, in which three single-ply plain-weave cloths are stacked and interlaced. It gives a seven-step rule for constructing the 3-ply weave on point paper, explains how the warp and filling threads can be transposed to change which ply is face, centre or back, and describes how to build a weave plan from a three-color design. Fig. 38 shows the diagrams a through i.