CAPTAIN NOBLE AND MR. F. A. ABEL ON FIRED GUNPOWDER, 
Experiment 167.—Weight of vessel, 52,931"6 grs. (3430 grins.). 
Temperature of air. GO’O F. 
,, steam.2I1T4 „ 
,, calorimeter before experiment . . 55*75 „ 
„ „ after „ . . 84'52 ,, 
Loss of heat in vessel . . 211°T4 — 84 o- 52 + 0 o- 2 = 126"82 „ 
Gain of heat in water (25,000 grs.) 28 c, 77 + l '86= 30‘63 ,, 
Hence specific heat of vessel=T140. 
Experiment 168.—The same vessel. 
Temperature of air.-.62’0 F. 
,, steam. 211T4 ,, 
,, calorimeter before experiment . . 55’48 ,, 
., „ after „ . . 84T0 ,, 
Loss of heat in vessel . . 211°T4 — 84°T0 + 0 o, 2 = 127-24 ,, 
Gain of heat in water. 28°-60 + l o, 85 = 30"40 „ 
Hence specific heat of vessel=’1132. 
Experiment 169.—The same vessel. 
Temperature of air. 62'0 F. 
„ steam .211T4 „ 
,, calorimeter before experiment . . 55 - 55 „ 
,, „ after ,, . . 84-30 ,, 
Loss of heat in vessel . . 211°T4 —84 o, 30 + 0 o- 2 = 1 27'04 ,, 
Gain of heat in water . 28 0- 75+1 0- 86= 30'61 ,, 
Hence specific heat of vessel=T138. 
Hence mean specific heat of vessel from three experiments^ T137. 
Determination of heat evolved by the various 'powders. 
A.—Small explosion-vessel. 
Weight of water, 30,000 grs.equivalent in water 
,, explosion-vessel, 21,311*6 grs. . ,, ,, 
„ powder products. ,, ,, 
Grs. 
30,000*0 
2,465-8 
. 28-5 
Equivalent in water, of contents of calorimeter. 32,494‘3 
When 200 grs. of powder used, the equivalent in water of the 
contents of the calorimeter is 
32,503-8 
