Part 3 of an International Correspondence Schools instruction paper on silk throwing, devoted to hard-silk winding, the step that unwinds raw silk skeins onto bobbins. It describes the winding frame in detail: swifts (pin-hub, friction-hub, six-arm and geared types), spindles and their springs, winder bobbins, driving cone pulleys, and the traverse motion with its cams, levers and porcelain thread guides. It also covers operating practice such as beating out skeins and starting spindles. The paper opens with advice to the student and closes with 20 examination questions; it has mechanical line drawings but no weaving drafts.