Information on the physical properties of materials used for jewel bearings which was obtained in the course of tests by the National Bureau of Standards for the Bureau of Aeronautics, U. S. Navy, is summarized. Inherent properties of the material which affect the ease of fabrication and the performance in use are described for the principal materials used for jewel bearings in aviation instruments, namely, synthetic and natural corundum (sapphire and ruby), synthetic spinel, and glass. Some incidental observations on the properties of synthetic spinel in relation to its use as a possible optical material are also included.

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