ON THE GASES EVOLVED FROM IRON FURNACES. 163 
proportion to their capacity for heat, we obtain, as the expression for the tem- 
1105 
ing with air, Sabo wes = = 1940°C., 
perature of the mixture of gas burni 
or 3522° Fahr. 
In these calculations we have neglected the influence exerted on the com- 
position of the products of combustion by the gases escaping from the iron 
ore and limestone. Of course this must differ according to the quantities of 
materials used in the furnaces, and we therefore select as a basis for the cal- 
culation the iron furnaces of Alfreton, belonging to Mr. Oakes, the dimen- 
sions of which are given in fig. 6. We proceed on the supposition that the 
carbonic avid of the limestone and the oxygen of the ore are separated as 
carbonic acid. The coal used in the furnace was subjected to distillation 
with the precautions already described, and the composition thus obtained 
gives us the limits to which the combustible constituent of the gases from 
the furnace might be deteriorated under the most unfavourable eae Onan 
Le Weightiof the coaluded sR RA . 25°71 70 
2. - coke remaining . . - « « 17:2894 
3. 4 gaseous and liquid products oF distillation - 84276 
4. 39 liquid products alone . . . . . . . « 5*7239 
5. Quantity of tar in the latter. 2. 2. 1 1 ee eee F945 
6. i water . . . 3°2294: 
ie Fr} chloride of platinum wri ammonium fon the 
latter’! -/20". - + 05498 
8. % sulphuretted hydrogen ‘and eartonte atid » « O8574 
9. bs sulphuret of lead formed. . . . . . « « 04530 
10. Weight of the condensed hydrocarbons . . . . . . . 01891 
The eudiometric analysis of the uncondensed gases gave the following re- 
sults :— 
Volume. | Temp. Pressure. 1m. at 0°C. 
GAUGED a eas eEize a decattuweesattas cevseces dds 119-9 10°C. | 04739 54°81 
After admission of oxygen wel 38044 10 06542 192-11 
After the explosion ........... ...| 189-9 10 0:5335 97°73 
After absorption of CO, ..... see| 125-9 9-9 0:4801 58-33 
After admission of hydrogen 350°1 9:9 0:6850 231-44 
PREPER OR PlOSION o/s tess. ehoesnesscdess shee 129-2 10 0°4625 57°64 
If we suppose that the very inconsiderable quantity of nitrogen found in 
the calculation (0°4:) was an unavoidable impurity, we obtain, by the use of 
the formula 1, 2,.3, the following composition for the gas examined :— 
According to volume. According to weight. 
Hydrogen. . Cie i Dba 0:001377 
Light carburetted hydrogen. - + 34°64 0:024656 
Carbonic oxide. . eli | hin 0005954 
54°81 0°031987 
The 2:2142 carbonic oxide, carburetted hydrogen and hydrogen found in 
the analysis consist therefore of— 
Light carburetted tiphe al am ve  kOOT, 
Carbonic oxide . . rashid yp tid Oe ul be 2, 
GTR EN ie etigh she vn) 3.) aoe 
22142 
M 2 
