Fig. 70.— I'ug-mill with Rolling Cylinders (Groke). point of view of output, than that of cyhnders of the same diameter. To regulate the speed a flywheel is attached to the gear-shaft (Fig. 71). Kig. 71. — Pug-mill with Rolling Cones (Jager). Rolling Machines ivith Fluted Cylinders or Cones. — The…