CAPTAIN NOBLE AND MR. F. A. ABEL ON FIRED GUNPOWDER. 
Grs. 
25,000-0 
6,018-3 
76-0 
31,094-3 
Experiment 171.—Exploded 400 grs. pebble. 
O 
Temperature of calorimeter before explosion . 5 4 "38 F. 
„ „ after „ . 69-43 „ 
Hence difference.15°"05 +1 0, 24 = 16"29 „ 
Hence heat evolvecl=703"41 gramme-units centigrade. 
Experiment 172.—Exploded 400 grs. 11. L. G. 
O 
Temperature of calorimeter before explosion . 57"08 F. 
„ „ after „ . 72-44 „ 
Hence difference. 15 0, 36+1 0, 26= 16‘62 ,, 
Hence beat evolved= 717*7 gramme-units centigrade. 
Experiment 173.—Exploded 400 grs. R. L. G. 
O 
Temperature of calorimeter before explosion . 57"22 F. 
,, „ after „ . 72-74 „ 
Hence difference.15°"52-|-1 0 '26 = 16‘78 ,, 
Hence heat evolved=724'7 gramme-units centigrade. 
Experiment 174.—Exploded 400 grs. pebble. 
° 
Temperature of calorimeter before explosion . 57" 13 F. 
,, „ after „ . 72*42 „ 
Hence difference.15°"29 +1°"26 = 16*55 ,, 
Hence heat evolved = 7147 gramme-units centigrade. 
Experiment 175.—Exploded 400 grs. pebble. 
° 
Temperature of calorimeter before explosion . 56-40 F. 
„ ,, after ,, . 72*00 ,, 
Hence difference ..... 15°*6+1°*27 = 16*87 „ 
Hence heat evolved=728*5 gramme-units centigrade. 
B. —Large explosion-vessel. 
Weight of water, 25,000 grs.equivalent in water 
,, explosion-vessel, 52,931*6 grs. . ,, ,, 
,, powder products, 400 grs. . . „ ,, 
Equivalent in water, of contents of calorimeter. 
