CAPTAIN NOBLE AND MR. F. A. ABEL ON FIRED GUNPOWDER. 
275 
Experiment 197.—Fired 10,000 grs. of mining powder in cylinder containing 
15,500 grs. of water. A good deal of gas escaped past crusher-plug. 
a. 
A. 
a. 
Crash. 
Pressure. 
•700 
•0833 
•0417 
A 
•220 = 
20'8 tons per square inch. 
B 
•221 = 
20-8 
C 
•226 = 
21-2 
Deposit approximately =2025 grs. water. 
Experiment 198. —Fired 10,000 grs. Curtis and Harvey’s No. 6. 
The greater proportion of the gases escaped, the gas getting between the steel 
barrel and the coil, by the screw of the crusher-plug, causing the coil to crush and 
indenting the steel and the coil in a very remarkable manner. 
a. 
A. 
a. 
Crush. 
Pressure. 
•70 
•0833 
•0417 
A 
•214 = 
19'95 tons per square inch. 
B 
T97 = 
19-11 
C 
•197 = 
19-11 
Experiment 199.—A series of experiments in guns of various calibres with mining 
powder. 
Experiment 200.—Fired cylinder hooped with B. It. iron No. 3, and with a capacity 
of 11,000 grs. water, with a charge of 8750 grs. pebble, and 2250 grs. F. G., 11,000 grs. 
in all. Copper in crusher-plug crushed beforehand to 35 tons. 
Head of crusher-plug broke off by the explosion, and gas escaped, taking, as nearly 
as could be guessed, from one to two seconds to escape. 
Outside diameter of cylinder before firing . . 10 ’ ,- 368 
„ ,, after „ . . 10 ,/- 393 
Pressure developed over 39 tons, but not reliable, owing to the escape of the gases. 
Experiment 201.—Fired cylinder hooped with Siemens’ mild steel No. 2, and with 
a capacity of 11,200 grs. water, with a charge of 11,200 grs. powder, consisting of 
8750 grs. pebble and 2450 grs. F. G. 
Gas escaped with great rapidity past the firing cone, which was of course destroyed ; 
great difficulty found in extracting the crusher-piston, which had been jammed by the 
compression of the chamber in which it was placed. Its record was therefore 
valueless. 
Experiment 202.—Fired same cylinder with a charge of 13,640 grs. powder, of 
which 8375 grs. were pebble, the rest F. G. Crusher-plug blew out before charge 
fully fired. 
2 N 2 
