Making the sand moulds for pig iron.; Underwood & Underwood Stereographs of Manufacturing Industries, Set 5 - Making iron and steel by several processes, Image 23 - Making the sand moulds for pig iron. These stereographs were created and sold as a set for educational use by Underwood & Underwood, a maker of stereoscopic images and equipment. This set was produced between 1895, when the educational unit was established, and 1921, when the company was sold.

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