469 
pressure-—distance curve of a givenexplosive, The latter method is useful 
in providing an extrapolation of an experimental peak pressure-distance 
curve, measured over a limited range of distances, to smaller or larger dis- 
tances from the charges. 
The constants of integration may be taken to be Te and 9, » the 
initial values of the reduced pressure and energy variables. The initial 
pressure b, for the instantaneous detonation state corresponding to adiabatic 
isometric conversion of the explosive charge to its products is determined 
by Eqs. 2.4 and 2,6. The initial value of the reduced energy variable is 
then determined by Eq. 8.23. 
b/B. 
In order to determine 9, » given by 
my 7s) [BN (i J+ |, (8.35) 
it is necessary to determine the partial derivatives (du ot), and 
(dp /ot), e The equations of hydrodynamics in the gas sphere and in the ex- 
terior medium yield four relations, 
Beh dt eae tie) ie)? 
# 
* rs 
» fdu Neat 2) 2 ae 2 eae oe (= meee (8.36) 
Clim) *arae) 32> a Gee) * (Ge) 
