Public domain
Production. Tin smelting. Two laboratory assistants at a Southern tin smelter perform delicate analytical operations that determine the amounts of pure metal remaining in slags from the furnaces. Accurate laboratory control is one of the important reasons why the percentage of metal recovery from th
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Credit lineProduction. Tin smelting. Two laboratory assistants at a Southern tin smelter perform delicate analytical operations that determine the amounts of pure metal remaining in slags from the furnaces. Accu. 1942-01-01. Hollem, Howard R., United States. Office Of War Information. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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