Lesson XVIII of the Textile World Record's textile design school series, on binder warps: extra warps, usually cotton, that stiffen or bind fabric structures. It covers binder warps in single cloth (silk dress goods built on 5- and 8-leaf satin and 2x4, 2x6 and 2x8 warp rib weaves, each combined with a plain binder at ratios from 2:1 to 4:1), and in cotton pique and figured dress goods. It also covers double cloth for men's wear, where binder warps join two plain or twill fabrics, and pile fabrics such as tapestry and Brussels carpets. Most pages carry weave drawdowns (Figs. 1-47) and thread-interlacing diagrams, with text on repeats, ratios, take-up and the need for separate warp beams.