"The iron-stone is first mixed with coal, and piled in great heaps in the open air. The heaps areset on fire and left to burn for days. This is called roasting the ore. It bur ns away the sulphur and some of the other useless parts of the ore. Theroasted iron-stone is next put into the blast furnace. This great furnace is made of solid stone and brick- work, built in the form of a cone or sugar-loaf. Just think of a great sugar-loaf seventy feet high, Norah.""Teacher showed us a picture of a blast Furnace," said Will. "It was so easy to understand all about it from the picture. It looked as if the great furnacehad been cut down through the middle, from the top of the cone to the ground.
