CAPTAIN NOBLE AND ME, E. A. ABEL ON FIEED GUNPOWDER. 
141 
yellow shading into dark yellow. Colour of fracture grey, shading off into dirty yellow 
and occasionally into gamboge. Powerful odour of sulphuretted hydrogen. 
Crush, copper Pressure 
’ a ‘ cylinder. in tons. 
•4258 -1667 -0833 -054 8-4 
Experiment 11, July 5, 1871. — Fired 5881 grs. (381-09 grms.) R. L. G. in cylinder 
No. 4. Some little escape of gas past crusher-plug. Residue very hard and adhering 
strongly to the side ; a portion obtained in solid lumps. Colour grey on surface, black 
next steel. Fracture olive-green. 
A good deal of the deposit was chiselled off in the form of fine dust, and this, when 
it had lain for a minute or two, heated very much, say to about 80° or 90° C., agglo- 
merating into loose lumps and changing from a light greenish-grey colour to a bright 
yellow. A portion of this last deposit was collected in a separate bottle. 
When the crusher-gauge was taken out, the plug at the end was found to be broken 
right through transversely. 
The fracture was perfectly clean and bright ; it was therefore concluded that it must 
have broken after the great heat had subsided. 
. Crush, copper Pressure 
cylinder. in tons. 
•3947 -1667 -0833 -051 8T0 
Experiment 12, July 8, 1871. — Fired 6344 grs. (411-09 grms.) P. powder in cylinder 
No. 6. A good deal of leakage past the crusher-plug. Gas collected. Residue very 
hard, but it split off tolerably easily. The colour was grey throughout ; fracture much 
the colour and appearance of slate. The difference in physical appearance between 
this residue and that in the last experiment was very great, the colour of the fine dust 
being grey, while in the last experiment it was a light yellow. 
s . Crush, copper Pressure 
cylinder. in tons. 
•4258 -1667 -0833 -063 9-1 
Experiment 13, July 12, 1871. — Fired 7351 grs. (476*34 grms.) R. L. G. in cylinder 
No. 6. The products cut away the screw of the pressure-gauge and escaped. 
g ^ a Crush, copper Pressure 
cylinder. in tons. 
•4934 -1667 -0833 -091 11-5 
Experiment 14, July 12, 1871. — Fired 7930 grs. (513’86 grms.) P. in cylinder No. 4. 
Gas and residue collected as usual. Cylinder tight. 
2. A. 
■5322 -1667 
Crush, copper Pressure 
cylinder. in tons. 
‘•100 12-2 
•0833 
