It is our desire to acknowledge the continued interest of Dr. A. T. Waterman, Deputy Chief, 
Office of Naval Research, Navy Department, without whose help these volumes could not have 
been produced, to thank Mr. Martin Jansson ofthe Technical Information Division, Office of Naval 
Research, and his capable staff for their painstaking and careful work in preparing the material 
for reproduction. We also acknowledge the guidance afforded by the British Undex Panel, partic- 
ularly Dr. A. R. Bryant and Dr. E. N. Fox (a former member), the assistance of Mr. T. Aves of 
the Department of Research Programmes & Planning and Miss E. Lord of the Department of 
Physical Research in the preparation ofthe Britishcontribution, and to thankDr. T. L. Brownyard 
of the Bureau of Ordnance Navy Department for his help in some of the correspondence and in 
some of the problems of security clearance. 
C.K. Meta. 
G. K. Hartmann 
Chief, Explosives Research Department 
U. S. Naval Ordnance Laboratory. 
— 7 
E. G. Hill 
Department of Physical Research 
Admiralty 
vi 
