IRON AND IRON MOLDING 



371 



furnace in a modern plant consists of a tower of masonry from 

 50 to 100 ft. high, lined with firebrick and cooled by means of 



FIG. 185. Blast Furnace. 



water flowing through the pipes surrounding it. Boiler plates 

 are used as a reinforcement. The furnace is charged from the 

 top through a hopper, first with kindling wood, followed later 

 by alternate layers of coke, iron ore, and limestone. 



