At the time of filming in 1974, this plant had been manufacturing steel nonstop for 102 years using the Bessemer process. [Sir Henry Bessemer]’s method for turning pig iron into steel was a ...

The Bessemer process pumps air through the iron to remove impurities. shropshirehistory.com The production of steel is done with the Bessemer process, which takes the molten pig iron and blasts ...