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Conversion. Copper and brass processing. Copper tube is made either by extrusion or piercing. In the piercing method, illustrated here, a hot round billet, or solid piece of copper, about fourty-five inches long, is rotated between tapered rolls and forced against a pointed mandrel which pierces the
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Conversion. Copper and brass processing. Copper tube is made either by extrusion or piercing. In the piercing method, illustrated here, a hot round billet, or solid piece of copper, about fourty-five inches long, is rotated between tapered rolls and forced against a pointed mandrel which pierces the

Palmer, Alfred T., United States. Office For Emergency Management · 1942-01-01 · photo, print, drawing

From the collection of Library of Congress. Free to download, adapt and use — no permission needed.

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cuyahoga countynitrate negativesunited stateseuclidohio
Credit lineConversion. Copper and brass processing. Copper tube is made either by extrusion or piercing. In the piercing method, illustrated here, a hot round billet, or solid piece of copper, about fourty-five . 1942-01-01. Palmer, Alfred T., United States. Office For Emergency Management. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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