IRON 



993 



arch at both sides of the furnace, not far from the bridge, into which, at a certain stage 

 of the operations, tuyeres are introduced (being placed at an angle of 25) also connec- 

 ted with the blast-apparatus, and provided with regulating valves. 



1253 1254 



Eck s Gas Reverberatory Furnace. Plan. 

 1255 



Cross section at c, D, on Plan. 



End view. 



The refining process is conducted as follows : The hearth of the furnace having 

 been constructed or repaired, a brisk coal-fire is kindled in the generator, through 

 tho opening at the bottom, which is afterwards bricked up. About 20 cubic feet of 



VOL. II. 3 S 



