An International Textbook Company instruction paper (Serial 493) on loom attachments for cam looms, covering undercams for three- to six-harness work. It explains how to construct cams for 3/1 and 2/2 twills and five-harness satin, the auxiliary shafts and gear calculations that set cam speed, and the harness-roll (strap-and-roller) arrangements. It also describes plain and tape selvage motions, side-cam motions, and continuous take-up motions, with many mechanical diagrams.