Studies of the behavior of vibrating crystal plates under the action of external forces and torques are of importance because they afford a means f o r getting at the highly involved problems associated with the deviations in frequency experienced by a crystal subJected t o t h e shock and vibration w h i c h m i g h t be m e t with i n high-acceleration vehicles, such as aircraft, guided missiles, or satellites. By searching out the mechanisms concerned with such frequency variations, methods m y be developed t o minimize o r perhaps indeed eliminate them.

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