Workers making sand molds to produce pig iron at a blast furnace in Pittsburgh, Pennsylvania. ca. 1905

Description

Workers making sand molds to produce pig iron at a blast furnace in Pittsburgh, Pennsylvania. ca. 1905. Copyright Keystone View Co. Molten iron would be poured into the molds and allowed to cool before the sand would be knocked off the pigs.

Source and Copyright

Medium Black and White Photograph
Source Library of Congress
Copyright Public Domain
Disclaimer Courtesy of the Library of Congress