An International Correspondence Schools-style instruction paper (Serial 486, Edition 1) on the construction, setting and adjustment of power cam-looms for woolen and worsted fabrics. It covers the principal motions (shedding, picking, beating up) and the auxiliary motions (let-off, take-up, filling stop-motion, protector motion, selvage motion, temples), with a section on loom production. Side-cam and under-cam shedding are described, including how to construct and set harness cams. It is illustrated with many mechanical line drawings and contains no weaving drafts.