An International Correspondence Schools instruction paper on chain warping, the industrial method of making warp yarn into loose ropes (chains) for bleaching, dyeing and sale. It explains short- and long-chain systems, spooling, thread and pin leases, and five warping methods: hand warping, warping mills, balling warpers, Denn warpers and Walcott warpers. Most of the text covers the construction and operation of the balling warper and its attachment, including traverse and winding motions, lease clock measuring and gear calculations. It ends with examination questions for students.