Article by Albert Walton in Cassier's Magazine (1911) on driving self-acting spinning mules with electric motors. It explains the mule's cycle (run-out, twisting, back-turns, run-in) and the sharp power peak when the spindles accelerate. It then compares group drive, individual motors with a 250-pound flywheel, and flywheel-free motors with looser speed regulation, including a side-by-side demonstration on worsted mules and power curves. Walton favors a constant-speed standard motor driving the existing countershaft.