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THE results of an extensive research in motorcar suspension fundamentals are presented with a description of a new-type spring member using air as the load-carrying means. Methods of actually realizing extremely low spring rates with attendant comfort to the passenger are shown. Shock absorption and anti-body-roll devices are incorporated in, and function as integral parts of, the new suspension. A series of new tools are presented for the chassis engineer's consideration in designing better riding comfort into the new car. These include in a simple, practical light-weight unit, variation of spring rate with wheel position, approximate aperiodic body damping, body roll reduced to better than that secured with high-rate springs, wide range of load capacity with practically constant body frequency, and ability to adjust wheel position to the optimum point. Typical applications are illustrated together with numerous curves outlining the stated characteristics.