ON THE GASES EVOLVED FROM IRON FURNACES. 161 
These results enable us to determine the composition of the furnace-gases. 
It is clear that the 68°92 per cent. of carbon found in the analysis will be 
converted by the blast into carbonic oxide above the tuyére. -As we have 
already seen that the coal loses its gases by distillation near the top of the 
furnace, a corresponding weight of coke must burn before the tuyére, and 
hence we require only to add to the composition of the furnace-gases the 
carbonic oxide produced by the combustion of 68-92 per cent. of carbon and 
the nitrogen of the air expended in the combustion. This calculation gives— 
Nitrogen - 2 2 2 6 6 ee wo 64135 
Carbonie oxide::2. 0 5. Sef 8 0s BETES 
Light carburetted hydrogen. . . . 17464 
Carbonic acid.) Sis! e ear een OE 
Condensed hydrocarbons. . . . . O154 
Sulphuretted hydrogen . . . «. - O14 
EL OACOR LT se a tha a ae! hole sa OF 
Ammonia® 2) 0-6 eke elo ee OO 
100:000. 
If we calculate, with reference to these circumstances, and according to 
volume, the composition of the gases escaping from a furnace filled with Gas- 
forth coal, we obtain— 
INiGRO EA”) 025 ei oy a ME) 6 net) 02 ey ye EDABS 
Carbonic oxide... sy «i els 4 +0» 832168 
Light carburetted hydrogen . . . 2°527 
Carhonic acid) ij c65 5 ws oe ein BD 
Condensed hydrocarbons. ... . - O15] 
Sulphuretted hydrogen . . . . - 0°091 
EARAROB CR os 0), op dre signe oe eh wal 
AIBMABEE GE) Vel ah sj yas es ef ears  OOTO 
100:000 vols. 
The result thus obtained affords a very simple means of determining the 
influence exerted upon the composition of furnace-gases by the gaseous pro- 
ducts of distillation of the coal. If we suppose the coal to be freed from its 
volatile products, and exposed to the action of a stream of air in a furnace, 
a volume of air containing 62°423 nitrogen will be converted by the influence 
of the red-hot coal into a gaseous mixture of the following composition :— 
Nitrogen. . . 2. - « 62423 
Carbonic oxide . . . . 32°788 
Accordingly, we obtain a gaseous mixture— 
Of gases generated by combustion . ee Bet - a NCE SR ia i Sear 
Carbonic oxide . . . . . 0-380 
Light carburetted hydrogen . 2°527 
Carbonicacid . . ... . 0139 
Of gases generated by distillation .< Olefiantgas . . . . . . O51 
Sulphuretted hydrogen . . 0091 
Hydrogen=":. 2. - 1431 
(Ammonia. <j) «ya cohen a OZ 
100-000 
Thus we see that there is a considerable influence exerted by the gaseous 
_ products of distillation on the composition of the gases produced by com- 
_ bustion. 
1845. M 
. 
‘ : 
