There are no gears, no complicated controls or levers and neither manual shifting nor clutching is involved in these systems. The unique design of the movable face in each "driver" and "driven" member causes automatic, infinitely varying and thus smooth shifting action between the system's low and high range ... with constant optimum ratio between engine and drive wheel. Since these devices consist of a belt and two variable pitch pulleys all working together harmoniously, serving as both clutch and transmission, they are often called a "variable speed drive system". Weather-proof, completely mechanical and occupying minimum space, they can operate mounted in any position and are adaptable to a wide variety of applications. Each Comet System is fully automatic and can be used anywhere that control by engine throttle alone is desirable. Since ratio selection and "down shifting" is automatic, braking and vehicle control are enhanced. Even engine and drive train component life (sprocket, chain, bearings, etc.) is extended since shifting is smooth and not subject to the hazards of manual control. The years of Comet engineering experience, fine materials, special processes and control procedures for quality that are used in the manufacture of Comet Torque Converter Drive Systems are without peer.