Public domain
Transformer manufacture. When completed, this transformer will supply electric furnaces with the power needed to produce steel for Uncle Sam's ships and tanks and guns. The cooling coils pictured here are made of copper. A new process of forced oil cooling adds efficiency to these coilings; oil thro
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Credit lineTransformer manufacture. When completed, this transformer will supply electric furnaces with the power needed to produce steel for Uncle Sam's ships and tanks and guns. The cooling coils pictured here. 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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