The basic principles of ring spinning were described in Chapter 6, and it was explained that, as the traveler circulates the ring, it pulls with it the yarn length between the pigtail lappet guide and the traveler. This length circulates the axis common to the spindle, ring, and lappet guide. In doing so, the yarn length balloons, and the tension, air-drag, and the inertial, central, and Coriolis forces acting on the yarn length govern the balloon geometry.