A reference collection of color-and-weave twill patterns for straight draw threadings on 2 to 8 harnesses, with over 1800 computer-generated drawdowns. The introduction explains how the number of distinct twills is counted (1 for 3 shafts, 2 for 4, 4 for 5, 14 for 6, 52 for 7, 320 for 8). Each treadling sequence is shown with several warp and weft color arrangements in black and white (W, B, BW, BWWB, BBWW and others). A closing section of photographs of woven samples refers back to the drawdown pages.