This section is from the "A Complete Dictionary of Dry Goods" book, by George S. Cole. Also available from Amazon: A complete dictionary of dry goods and history of silk, cotton, linen, wool and other fibrous substances,: Including a full explanation of the modern processes ... together with various useful tables.
Factory Yarn. Coarse 2-ply or 3-ply unscoured woolen yarn, or yarn "in the grease." It is usually made by the interior woolen mills, and is used by country people for the knitting of heavy winter hose. Frequent washings remove the grease, leaving the knitted article clear, soft, and extremely warm and durable. It is generally put up in hanks 4-to-the-pound, and unlike fancy yarns weighs out full 16 ounces per pound.