PREFACE The author wishes to acknowledge the assistance in the planning and execution of this project by the following people: Maj R.H. Myers; LCDR B.S. Merril; J.G. Lewis; The Chief and mem- bers of the Special Projects Branch, ERDL, Fort Belvoir, Virginia; the Chief and members of the Blast Branch, Headquarters DASA; Lt Col J.W. Kodis, Lt F.E. Shoup, and C. Barnett, Program 1; and to Projects 1.7 and 1.8 for transient displacement and pressure measurements. The author would also like to thank PFC D. Carpenter for his assistance in the preparation of art work.