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To conclude, the theory presented herein describes a dynamically 

 possible mode of motion, and one which can be handled simply, in a mathematical 

 sense. Because the theory is based, for the most part, on experimentally 

 observed facts, there is a strong possibility that the motion derived from it 

 approximates closely that of a diaphragm deforming plastically after having 

 been given an initial uniform velocity normal to its original plane. 



In acknowledgment, the writer expresses his appreciation to 

 Professor ii. H. Kennard for his many useful suggestions and helpful criticisms 

 in regard to the original development of this theory; to Mrs. ii. L. Miller 

 who performed the calculations leading to Figure 5| to Miss M, Pfeiffer in 

 helping prepare the final manuscriptj to Mr. 1£. Storm for proofreading and 

 checking the mathematics} and to his wife for her patience during the several 

 attempts at writing this article. 



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