1289 
ABSTRACT 
The best utilization of the pressure and momentum 
produced by an explosion need not be for head-on impact of 
the shock=wave. Theory predicts that the pressure produced by 
oblique impact may exceed that obtained by head-on impact of 
the same shock. The theoretical investigations have been 
summarized by J. von Neumann in ERR No. 12 on "Oblique Reflection 
of Shocks." 
The present report deals primarily with the reflection of 
plane shock-waves in water-like substances. It is shown that 
in the case of water the pressure for any oblique, "regular" 
reflection of a given shock is greater than that for head-on 
reflection. A complete set of graphs for quantities involved 
in regular reflection is furnished for Y the adiabatic ex- 
ponent, equal to 7.15 for water and 2.00 (also certain ones 
for ee 1.40 —for comparison with the RankineHugoniot values). 
For convenience there are included essential formulae and tables 
of various functions used in the discussion of the propagation 
of plane shock=waves in water-like substances with y= 7.15 and 
2.00. 
To complete the theoretical discussion the one-dimensional 
interaction of shock=-waves and rarefaction-waves has been con- 
sidered, as well as the so-called "simple" theory of three-shock 
intersections. The latter may be of value in the interpretation 
of the Mach phenomenon, which occurs when regular reflection 
ceases. Graphs of the parameters needed to specify three=-shock 
configurations in water are accordingly given. In this 
-=j- 
