have been produced, to thank Mr. Martin Jansson of the 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, particularly 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 of the British contribution, and to thank 

 Dr. 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. 



G. K. Hartmann 



Chief, Explosive Research Department 



U.S. Naval Ordnance Laboratory 



^-^gto- 



E. G. Hill 



Department of Physical Research 



Admiralty 



