262 
CAPTAIN NOBLE AND MR. E. A. ABEL ON FIRED GUNPOWDER. 
Experiment 194.—301'315 grins, mining powder, density = ‘3. 
From analysis of solids 
„ >? g as • 
„ mean 
Calculated solid 
products, 
grms. 
142743 
143-895 
143-319 
Calculated gaseous 
products, 
grms. 
153-921 
152- 569 
153- 145 
Elements in— 
K. 
C. 
S. 
H. 
O. 
N. 
Remarks. 
Gaseous state .... 
39-601 
10-909 
1-714 
75-330 
25-591 
Solid state. 
70-596 
11-801 
35-901 
•205 
23-488 
1-328 
Total found .... 
70-596 
51-402 
46-810 
1-919 
98-818 
26-919 
Originally in powder 
72-014 
54-026 
45-378 
1-989 
95-336 
25-943 
Difference. 
-1-418 
-2-624 
+ 1-432 
-•070 
+ 3-482 
+ •976 
Oxygen in hyposulphite, 2"062 grms. 
ABSTRACT OF EXPERIMENTS. 
In this abstract the following abbreviations are used :— 
§, to represent the mean density of the products of explosion; A, the area of the 
piston of the crusher-gauge ; a, the sectional area of the copper cylinder. 
Experiment 96.—4560 grs. (295"49 grms.) It. L. G. ; this experiment is No. 39 
repeated. On opening cylinder appearances as usual—colour of fracture, a dark bluish 
grey ; surface not smooth but wavy; tears remained adhering to the side, and the 
usual sooty deposit observed. 
o. A. a. Crush. Pressure. 
"57 "0833 "0417 ’134 14"32 tons per square inch. 
Experiment 121.—Fired 5960 grs. (386"21 grms.) It, L. G. in large cylinder. 
Density "4. 
On opening, appearances much as usual. Fracture, slaty grey with yellowish por¬ 
tions. Divided deposit into two portions, top and bottom. Bottom decidedly more 
yellow than the top. Divided again top and bottom portions into two parts, one 
bottled and sealed with as little exposure to the air as possible, the other ground and 
freely exposed to the air for 48 hours. 
