142 
CAPTAIN NOBLE AND ME. F. A. ABEL ON FIEED GUNPOWDER. 
Experiment 15, July 22, 1872. — Fired, in cylinder No. 6, 1586 grs. (102-77 grins.) of 
F. G. Cylinder perfectly tight. Gas and residue collected. 
* . Crush, copper Pressure 
d • A ‘ a ‘ cylinder. in tons. 
•1064 *1667 -0467 -003 1-66 
Experiment 16, July 22, 1872. — Experiment 15 repeated with tin cylinder. 
^ Crush, Pressure 
A - a ' tin. in tons. 
•1064 1667 -0467 '148 1-25 
Experiment 17, July 24, 1872. — Fired, in cylinder No. 6, 3172 grs. (205-55 grms.) 
F. G. Collected gas and residue. Residue very hard, but not so dark in colour as that 
in experiment No. 16. Surface dark grey, but of a lighter colour when fractured. 
A very thin coating on the sides of the cylinder. 
Small bright yellow crystals pretty uniformly distributed through the residue. 
2 . 
A. 
et. 
Crush, copper 
Pressure 
cylinder. 
in tons. 
•2129 
•1667 
•0417 
•0475 
3-70 
Second experiment. 
•2129 
•1667 
•0417 
•0435 
3-58 
Experiment 18. — Fired 4758 grs. (308-32 grms.) F. G. in cylinder No. 6. Cylinder 
perfectly tight. Collected gas and residue. 
On opening the cylinder the residue was found all collected at the bottom ; and it had 
evidently run down the sides in a very fluid state, the deposit on the side being very 
thin. Colour on surface dark grey. Fracture more uniform than usual, there being 
no patches of yellow and but few of a lighter colour. 
„ . Crush, copper Pressure 
o. A. a. , rr . , 
cylinder. m tons. 
•3193 -1667 -0467 -132 6-75 
Experiment 19, August 26, 1872. — Fired, in cylinder No. 6, 6344 grs. (411-09 grms.) 
F. G. Cylinder perfectly tight. Colour and fracture dark grey, nearly black ; but in 
places both surface and fracture light grey. No appearance of yellow anywhere in this 
deposit. All the residues, so far, of F. G. differ very considerably in appearance both 
from pebble and R. L. G. 
The deposit on the sides was exceedingly thin, not more than ‘01 inch in thickness. 
2 . 
•4258 
(This pressure rejected.) 
A. a. 
•1667 
Crush, copper Pressure 
cylinder. in tons. 
•222 9-98 
•0417 
