g(l + H) 



(KTy ' 



KT » 1 



Acknowledgment* 



Unpublished data for the wave-height ratio of the 

 floating elliptic cylinder were furnished by Cdr. W. R. 

 Porter, and the author is very grateful to Dr. Porter for 

 supplying these data. The curves of the roll-exciting 

 moment for the submerged ellipsoid were constructed by 

 Mrs. Helen W. Henderson. 



The author also takes this opportunity to acknowledge 

 two constant sources of assistance: Dr. T. F. Ogiiviefor 

 his supervision and innumerable stimulating discussions, 

 and Miss Evelyn I. Giesler for her patience in typing. 



References 



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 Nauk S.S.S.R., Otdelenie Tekhnicheskikh Nauk, No. 7, 

 1957, pp. 65-79. (English translation available as David 

 Taylor Model Basin Translation No. 307, March 1962.) 



2 J. N. Newman, "The Damping of an Oscillating 

 Ellipsoid Near a Free Surface," Journal of Ship Re- 

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 David Taylor Model Basin Report 1500. 



3 T. H. Havelock, "The Forces on a Submerged 

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4 R. G. Dean and F. Ursell, "Interaction of a Fixed, 

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5 O. Grim, "Die Schwingungen von schwimmen- 

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6 A. F. Zahm, "Flow and Force Equations for a 

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8 F. Ursell, "On the Heaving Motion of a Circular 

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9 O. Grim, "Berechnung der durch Schwingungen 

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10 F. Tasai, "On the Damping Force and Added 

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11 W. R. Porter, "Pressure Distributions, Added 

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12 R. C. MacCamy, "On the Heaving Motion of 

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