266 
CAPTAIN NOBLE AND MR, F. A. ABEL ON FIRED GUNPOWDER. 
Experiments for the determination of the specific heats of the vessels used for 
determining the heat generated by explosion. 
In all cases the vessel was boiled, and then kept for five minutes suspended in the 
escaping steam; it was then transferred to the calorimeter containing 30,000 grs. of 
distilled water. 
Experiment 141.—Weight of vessel, 21,311'6 grs. (1381 0 grms.). 
O 
Temperature of air. 58'8 F. 
,, steam.211*65 ,, 
,, calorimeter before immersion of 
vessel.5S*88 ,. 
,, calorimeter after thermometer be¬ 
came stationary.70'08 ,. 
Loss of heat in vessel . . 211 0, 65 — 70~*08 + 0°*2 = 141*77 ,, 
Gain of heat in water.11°*2 -fi-0°‘44 = 11 '64 ,, 
Hence specific heat of vessel=*1156. 
Experiment 142.—The same vessel. 
O 
Temperature of air. 59*0 F. 
,, steam.211'65 „ 
„ calorimeter before experiment . . 62*21 ,, 
„ „ after „ . . 73'20 „ 
Loss of heat in vessel . . 211°*65 —73°*20 + 0°*2 = 138*65 „ 
Gain of heat in water ..... 10°'99d-0°‘44= 11*43 ,, 
Hence specific heat of vessel=*1158, 
Experiment 143.-—The same vessel. 
Temperature of air.60'20 F. 
,, steam.212*20 ,, 
,, calorimeter before experiment . . 61*11 „ 
„ „ after „ . • 72*20 „ 
Loss of heat in vessel . . 212°*20 — 72°*20-|-0 o *20= 140*20 „ 
Gain of heat in water.ll°*09-|-0 o *44 = 11*53 „ 
Hence specific heat of vessel = *1155. 
Experiment 144.—The same vessel. 
O 
Temperature of air. 60*20 F. 
„ steam.212*10 ,, 
,, calorimeter before experiment . . 65*10 ,, 
„ „ after ,, . . 75*95 „ 
Loss of heat in vessel . . 212°*20 — 75°*95-|-0 o '2 =136*45 ,, 
Gain of heat in water.10°*85 + 0°*44 = 11*29 „ 
Hence specific heat of vessel=*1163. 
Hence mean specific heat of vessel from four experiments, *1158. 
