Keywords: Photograph of a Vat of Molten Pig Iron Being Poured into a Open Hearth Furnace at the Jones and Laughlin Steel Company, Pittsburgh, Pennsy - NARA - 535922 (high contrast).jpg en A huge ladle of molten pig iron being poured into an open hearth furnace at the Jones and Laughlin Steel Company Pittsburgh May 1942 NARA-image 535922 U S Office of War Information 1942-05 PD-USGov Photograph of a Vat of Molten Pig Iron Being Poured into a Open Hearth Furnace at the Jones and Laughlin Steel Company Pittsburgh Pennsy - NARA - 535922 tiff <gallery> File Photograph of a Vat of Molten Steel Being Poured into a Mold at the Jones and Laughlin Steel Company Pittsburgh Pennsy - NARA - 535922 tif </gallery> Open hearth furnaces in the United States Jones and Laughlin Steel Company Pittsburgh Pittsburgh in the 1940s Ladles metallurgy |