Science

The Eiffel Tower is made out of pure iron. Many think that the tower is made of steel, which didn't exist at the time for producing in large quantities. With the knowledge of the abilities of iron, Gustave settled with puddle iron. Puddle iron is a type of wrought iron used mainly in construction. Because the iron is produced in a puddling furnace, it allows better control over iron and provides more strength to the structure. Puddling iron was also used in the framework of the Statue of Liberty and several bridges.