CAPTAIN NOBLE AND ME. P. A. ABEL ON PIEED GUNPOWDEE. 
145 
On firing, a slight quantity of gas escaped with a puff. Gas collected. Surface of 
the deposit was rough and dark-looking. Fracture grey, with greenish-yellow patches 
in places ; hardly any deposit on sides. 
s . Crush, copper Pressure 
' a ' cylinder. in tons. 
•600 *0833 -0417 -150 14-80 
Experiment 38, November 28, 1872. — Fired 5320 grs. (344-736 grms.) P. in cylinder 
No. 7. 
A good deal of gas escaped through the gas-hole. Gas collected as usual. On open- 
ing, all the residue was found at the bottom ; but in cooling the residue had contracted 
very much, separating on one side from the cylinder and leaving a considerable crack. 
The surface had a frothy appearance, as if occluded gas had been given off while still 
fluid. Colour dark grey on surface. Texture much more open than usual. Very 
much less yellow than in last experiment, and darker in colour than in experiment 36, 
from which the gas escaped. Examined the colour carefully next day, and found it 
had become more yellow, although not so yellow as the residue in experiment 37. 
^ ^ a Crush, copper Pressure 
cylinder. in tons. 
•7000 -0833 -0417 -203 18-60 
Experiment 39, November 29, 1872. — Fired 4560 grs. (295-488 grms.) It. L. G. in 
cylinder No 7. Cylinder was perfectly tight. Residue all at bottom and firmly 
attached to sides. Surface level, but little dark roughnesses all over it. Colour and 
fracture much the same as in last experiment, but a little more grey. 
^ ^ a Crush, copper Pressure 
cylinder. in tons. 
•6000 -0833 -0417 -144 14-36. 
Experiment 40, December 2, 1872. — Fired 4560 grs. (295-488 grms.) F. G. in 
cylinder No. 7. 
Cylinder tight, but a slight smell of sulphuretted hydrogen perceptible. Thirty 
seconds after explosion the cylinder was placed at an angle of 45°, and retained there 
for two minutes. When cylinder was opened the deposit was found lying at this 
angle, the surface being smooth and the edges sharply defined. Hence the deposit 
must have been perfectly fluid half a minute after explosion, and perfectly set two 
minutes later. Surface of deposit dark greenish grey ; fracture much the same colour, 
and considerably darker either than that of R. L. G. or P. The bottled deposit had a 
powerful smell of ammonia. 
g ^ a Crush, copper Pressure 
cylinder. in tons. 
•6000 -0833 -0417 T41 14-14 
Experiment 41, December 3, 1872. — Fired 5320 grs. (344-736 grms.) R. L. G. in 
cylinder No. 7. 
mdccclxxv. u 
