1084 
PROFESSOR W. N. HARTLEY ON 
Kilogramme Heat-units evolved bj the Combustion of the above Materials. 
Grms. 
Mn. 175,776 
C. 199,653 
Si. 99,573 
Kilo, heat-units 
Total kilo, heat- 
evolved by 
units evolved by each 
1 grm. 
element. 
X 
1-72 
= 302,335 
X 
2-45 
= 489,150 
X 
7-7 
= 766,712 
1,558,197 
Kilogramme heat-units evolved by the combustion of the manganese, carbon, and 
silicon in five tons of pig iron = 1,558,197. 
Grammes of Impurities eliminated from Five Tons of Pig Iron m the form of Gaseous 
Carbon Monoxide, solid Silica, and Manganous Oxide. 
Grms. 
Oxygen, grms. 
Nitrogen, grms. 
CO = 405,857 
SiO., = 211,768 
MnO = 226,911 
266,204 1 
,112,195 } 
51,135 J 
1,437,194 
Specific Heats for Equal Weights. 
CO ... . 0-245 Fe . . . . 0-11379 
N. 0-2438 Mn. . . . 0*1317 
Si.0-175 
Specific Heat of the Materials in the Converter and of the Products of Combustion. 
Grms. 
Sp. Heat. 
Kilo. 
heat-units. 
Weight of 
iron. 
. 4,605,238 
X 
0-11379 
= 524-0 
CO. 
465,857 
X 
0-245 
^ 114-1 
5 J 
N. 
. 1,437,194 
X 
0-2438 
= 350-4 
5) 
silica .... 
211,768 1 
These two substances form 
J) 
manganese oxide 
226,911 J 
a 
slag. 
The specific heat of glass, perhaps, approximates more closely to that of the slag 
than that of any other substance which has been determined. This is higher in the 
molten than in the solid state. 
Sp. Ht. Sp. Ht. 
At 212° F. = 0-177 : at 572° F. = 0-19. 
