276 
CAPTAIN NOBLE AND MR. F. A. ABEL ON FIRED GUNPOWDER, 
Experiment 225.—Fired 9000 grs. pebble and 3000 grs. F. G. in cylinder No. 2, 
containing 12,680 grs. water, less 670 grs. occupied by internal crusher-gauge. One 
internal crusher used ; gas escaped slowly. 
o. A. a. Crush. Pressure. 
1‘0 ‘0417 ‘0833 B crusher *193 = 42‘52 tons per square inch. 
C „ ‘193 = 42‘72 
Experiment 230.—Fired in No. 2 cylinder (Siemens’), containing 12,680 grs. 
11,360 grs. mining powder, same as that tested in the 2‘5-inch B. L. gun on 4th 
September, 1878. The gas escaped through the insulated cone, almost at once. It 
did not escape with any violence. 
Pressures indicated were as follow : — 
C. 
1 
A. a. 
0417 ‘0833 
Crush. Pressure. 
A T65 = 36‘8 tons per square inch. A, doubtful; piston 
B ‘200 = 43‘9 ,, [being jammed. 
C ‘200 = 43‘9 
Experiment 233.—Fired 9000 grs. pebble, and 4000 grs. F. G., total 13,000 grs. 
(842‘4 grins.), in No. 2 Siemens’ cylinder, cubic contents 12,680 grs.— 2000 grs. for 
two internal crusher-gauges; total contents, 10,680 grs. The pressure forced out the 
closing-plugs by shearing the threads. 
1‘21 
A. 
a. 
Crush. Pressure. 
A crusher ‘256 = 55‘6 tons per square inch. 
B ,, ‘256 = 55'6 „ 
C „ ‘260 = 56‘8 
‘0417 ‘0833 
