466 
SIR ANDREW NOBLE: RESEARCHES ON EXPLOSIVES. 
that the methods I have employed, and the conclusions at which I have arrived, will 
escape criticism. 
The results of the experiments given in the tables and plates may, however, be 
taken as very approximately correct, and the repeat experiments I have made show 
that there is great constancy in the transformation which takes place on explosion at 
any given density. 
I conclude by expressing my obligation to Dr. Sodeau and Mr. Hutchinson for 
their assistance in carrying out the various experiments, in the analysis, and in the 
laborious, but necessary calculations. 
Note. —In the case of the Norwegian ballistites, the pressures at densities above 0'3 
have been corrected to accord with the values obtained from the volume of the gas 
generated, multiplied by the units of heat determined. 
APPENDIX. 
Abstract of Experiments Referred to in Paper. 
ITALIAN BALLISTITE. 
Experiment 1528.—Fired in explosion vessel R, 15 grammes of Italian ballistite. Density of charge 0 - 05. 
Pressure 3-22 tons per sq. inch (490 *8 atmospheres). 
Permanent gases 9186’4 cub. centims. at 0° C. and 760 millims. 
Aqueous vapour 3843 - 9 cub. centims. 
Reconciliation. 
C. 
O. 
H. 
N. 
grammes 
grammes 
grammes 
grammes 
Found by analysis .... 
3-256 
9-515 
0-442 
2-604 
Originally in ballistite . . . 
3-444 
9-588 
0-422 
2-359 
Differences .... 
-0-188 
-0-073 
+ 0-020 
+ 0-245 
Experiment 1527.—Fired in explosion vessel R, 30 grammes of Italian ballistite. Density of charge O' 10. 
Pressure 6'42 tons per sq. inch (978-5 atmospheres). 
Permanent gases 18,565'1 cub. centims. at 0° C. and 760 millims. 
Aqueous vapour 6599 • 4 cub. centims. 
Reconciliation. 
C. 
O. 
H. 
N. 
Found by analysis .... 
Originally in ballistite . . . 
grammes 
6-585 
6-717 
grammes 
18-506 
18-698 
grammes 
0-806 
0-823 
grammes 
4-984 
4-602 
Differences .... 
-0-132 
- 0-192 
-0-017 
+ 0-382 
