National Geographic : 1947 Apr
© National Geographic Society Kodachrome by Willard R.Culver Where Bessemer Converters Spout Their Fiery Spray, It's the Fourth ofJuly All Year Round Batteries of these converters redden the night sky over Sparrows Point, Maryland. Air blown through molten ironcauses ashower of sparks and vapors tospout from the Bessemer's mouth. Liquid impurities form slag. After 15 or 20 minutes of blowing, the converter tipsand pours steel into ingot molds (Plate XVII).