The desirable properties of an elastic material applicable to many types of vibration-isolation problems are outlined. Of those materials at present available, rubber appears most suitable for this type of work. The general elastic properties of rubber are discussed and data given for determining the stiffness of pads made from one particular compound. Equations are developed for the six natural frequencies and associated modes of vibration of a mass supported on elastic pads and examples of vibration isolation worked out using this theory.

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