SIR ANDREW NOBLE: RESEARCHES ON EXPLOSIVES. 
463 
Bornstein, ‘ Physikalisch-chemische Tabellen,’ 1905; (2) of the constant h —these 
are all taken from Landolt, pp. 407-8 ; (3) of the specific heats at constant volume. 
Gases, &c. 
Specific heat, 
constant pressure. 
Value of k. 
Specific heat, 
constant volume. 
C0 2 . 
0-2986 
1-282 
0-232 
CO. 
0-2425 
1-401 
0-173 
H. 
3-4100 
1-408 
2-422 
CH 4 . 
0-5922 
] -316 
0 • 450 
N. 
0-2497 
1-410 
0-177 
HoO. 
0-4210 
1-330 
0-361 
Ihe specific heats calculated from the above data of the gases generated by the 
explosion of the six propellants are given in the tables, embodying the results of 
the whole of the experiments for each propellant, and in the tables are also given the 
temperatures of explosion deduced from equations (1) and (2), and here again it must 
be remembered that the temperatures with which artillerists are chiefly concerned 
are those due to densities varying approximately between O’l7 and 0 - 23. 
For the sake of clearness, the temperatures obtained from equations (1) and (2) are 
graphically shown on Plates 16, 17, and 18. 
Beginning with equation (1)—the Italian ballistite, which shows the highest 
temperature, commences at the density of 0'05 with 4943° C., this temperature 
hardly varying at all till the density of 0*25 is reached, when it slowly but regularly 
increases to about 5000° C. at d = 0‘45. Cordite Mark I, commencing at 4742° C. 
with 'a very slight fall, is practically constant up to d = 0’30, after which it rises 
somewhat rapidly to a temperature of 4921° C. at d = 0’45 and to 5060° C. at 
d = 0-50. 
M.D., commencing with 3814° C. with a slight fall, reaches the same temperature 
at d = 0‘22, after which it rises rapidly to about 4455° C. at d = 0H5. 
Norwegian ballistite 167 begins about 3748° C., and, with a very slight fall, regains 
the same temperature at d = 0’2, after which it reaches 4298° C. at d = 0'45 and 
4437° C. at d - 0‘50. 
Norwegian ballistite 165 has a temperature 350° C. lower between densities 0'05 
and 0-15, and, after the latter density, rises rapidly to 4177° C. at d = 0'45 and to 
4325° C. at d = 0‘5. 
Ihe nitrocellulose B.B., commencing at 3213° C., rises steadily, but not very rapidly, 
to 3861° C. at d = 0*45 and to 3977° C. at 0'5. 
W hen, however, we come to the temperatures given by equation (2), we are met 
with some very remarkable differences, which are shown by the tables, but which are 
more readily appreciated if reference be made to Plates 16, 17, and 18, in which the 
explosives are arranged in descending order of the temperatures developed. 
