In the town of Jérica in eastern Spain, one of the bells in the Torre de las Campanas is rung using a traditional manual system documented by the Asociación Campaneros Jérica. A rope is wrapped around part of the bell’s axle or yoke, and when the ringer pulls it, friction and leverage cause the bell to rotate and swing into motion. As the bell gains momentum, gravity and the shifting center of mass help carry it through each rotation, allowing a relatively small pull to keep the bell ringing smo