356 
Se iohes 
(a) In Penney's curve the equation of state for water aiffers from that used in the 
other work. 
(b) The density of T.N.T. was 1.59 gms./cc. in Kirkwood's(2) work, 1.565 in Penney’s work 
and 1.50 in the present calculations. The differences so introduced are not present 
calculations. The differences so introduced are not likely to be serious. They can 
be estimated by comparison of Kirkwood’s results for T.N.T. of densities 1.59 and 1.40. 
In Figure 4 a comparison is made of the present calculations with those of Penney and Dasgupta 
to see the effect of introducing a detonation wave. The equation of state for water Is identical 
in the two cases, the equation of state for the gas nct significantly different, but it should be 
noted that the initial conditions assumed by Penney and Dasgupta are such that the gas initially has 
a total energy of 800 calories per gram of explosive, as against 1028 calories per gram for the 
present calculations. This difference is partially counterbalanced by the fact that Penney and 
Dasgaupta use a T.N.T. of higher density (1,565 instead of 1.50), but this still leaves a discrepancy 
of 19% in the energy for a charge of the same volume. No attempt has been made to introduce any 
correction for this in Figure 4. 
Figure 5 includes all the theoretical curves of peak pressure against distance for T.N.T. 
Figures 6, 7 and 8 show the distribution of pressure and particle velocity as functions of distance 
for a T.N.T. charge at 3 different instants, while Figures 9, 10 and 11 give similar data fora 
T.N.T./Aluminium charge. The data for the conditions in the gas are only given between the 
interface and the first discontinuity in Q, for which region it will be unaffected by the behaviour 
of the discontinuity. 
TABLE IV. 
P—t Relationships for T.N.T. 
Table! Ve secse 
