FOREWORD 
The interests of the Office of Naval Research in arranging for the pub- 
lication of the collected hydrodynamical papers of Sir Thomas Havelock 
have a dual nature. First, we take great pleasure at this opportunity to 
express our respect and admiration for Sir Thomas, whose intellectual and 
scientific achievements in hydrodynamics have served as a source of inspi- 
ration and guidance for those researchers who are following him. Second, 
we feel that the increased accessibility of these important contributions of 
Sir Thomas which bear directly on many of today’s urgent problems will 
prove to be of great value to the hydrodynamic research community. 
Our sincerest appreciation is extended to the many persons who as- 
sisted in the preparation of this volume. We should like to express our 
thanks specifically to Sir Thomas himself, for his gracious permission to 
undertake this work; to the late CAPTAIN H. E. Saunders (USN, Ret.), for 
his continued interest and encouragement; to Mr. C. Wigley, for his efficient 
and careful task of editing; to Messrs. W. H. Ramey and I. S. Rudin and 
other staff members of the Technical Information Division, Naval Research 
Laboratory, for the preparation of the material for publication; and to Mr. 
J. W. Brennan, Navy European Patents Program, Office of Naval Research 
Branch Office, London, for obtaining copyright releases from the various 
publishers involved. Our thanks must also be extended to the following 
organizations for the copyright releases which made the publication of this 
volume possible: 
Andrew Reid & Company, Ltd., former publishers of “‘Proceedings of the 
University of Durham Philosophical Society”’ 
The Royal Institution of Naval Architects, publishers of ‘“Transactions 
of the Institution of Naval Architects’’ 
The Clarendon Press, publishers of ‘‘Quarterly Journal of Mechanics 
and Applied Mathematics’”’ 
The Royal Society, publishers of “‘Royal Society Proceedings, Series 
A? 
Taylor & Francis, Ltd., publishers of “‘Philosophical Magazine”’ 
North East Coast Institution of Engineers and Shipbuilders, publishers 
of “Transactions of the North East Coast Institution of Engineers 
and Shipbuilders”’ 
iii 
