CAPTAIN NOBLE AND ME. E. A. ABEL ON EIEED GUNPOWDEE. 
147 
Experiment 45, December 17, 1872. — Fired 6080 grs. (393-984 grms.) F. G. in 
cylinder No. 7. 
Gas escaped past cone. 
* a Crush, copper Pressure 
d- ' ’ cylinder. in tons. 
•8000 . '0833 *0833 -092 23-2 
Experiment 46, December 24, 1872. — Fired 3800 grs. (246-286 grms.) R. L. G. in 
cylinder No. 7. • 
The weight of the mild steel cylinder was 72,688 grms. After firing, the cylinder 
being perfectly tight, 9,912 grms. water were added. 
The temperature of the cylinder before firing was . 54°T5 F. (12°*28 C.). 
The temperature of the water before firing was . 55°-75 F. (13 o, 20 C.). 
After firing, the following observations of temperature were made, that of the room 
in which the observations were made being 56° F. (13 0- 35 C.) : — 
Temperature of water before 
explosion . 
55-75 F. (13-20 C.) 
„ „ 5 minutes after explosion 
67-0 
(19-4 C.) 
„ „ io 
55 
55 
70-8 
(21-5 C.) 
„ „ 15 
55 
55 
71T 
(21-66 C.) 
„ „ 20 
55 
55 
71-2 
(21-71 C.) 
» v 25 
55 
55 
71-0 
(21-6 C.) 
„ » 30 
55 
55 
70-8 
(21-5 C.) 
„ » 35 
55 
55 
70-5 
(21-35 C.) 
„ „ 40 
„ 
55 
70-5 
(21-35 C.) 
» 5? 45 
55 
55 
70-4 
(21-30 C.) 
„ n 50 
55 
„ 
70-3 
(21-25 C.) 
Since in twenty minutes the mass cooled by 0 o, 7, this amount should be added to 
the maximum temperature of the water. 
At fifty-five minutes after the explosion the gases were suffered to escape, and water 
taken from the calorimeter was placed in the cylinder. The temperature of the water 
was found to be 69 0, 4 F. (20 o, 72 C.). N.B. Volume of deposit=1180 grs. (76-464 cub. 
centims.). 
* . Crush, copper Pressure 
cylinder. m tons. 
•5000 -0833 -0417 -090 10-48 
Experiment 47, December 28, 1872. — Fired 6080 grs. (393-978 grms.) F. G. in same 
cylinder as was used in last experiment. After firing, the cylinder was at once placed 
in a vessel prepared for it filled with water. There was a slight crackling sound, but 
no escape of gas, except a few minute bubbles, which, however, soon ceased. 
u 2 
