Steel manufacture, Allegheny-Ludlum. Pig iron such as this is a major ingredient of steel. Blast furnaces have smelted down the iron ore to obtain the pig iron used in all three types of steel furnaces: open hearth, Bessemer converter, and electric
Summary
Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description
Tags
Date
01/01/1940
Contributors
Palmer, Alfred T., photographer
United States. Office of War Information.
Location
Brackenridge, 40.60812, -79.74116
Source
Library of Congress
Copyright info
Public Domain