Public domain
Steel manufacture, Allegheny-Ludlum. Peering through the peephole of a 25-ton electric furnace in which high quality alloy steels are being refined. Only with dark heavy glasses can melters study the action of the boiling alloy steels and determine whether adjustments are necessary to the electric p
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Credit lineSteel manufacture, Allegheny-Ludlum. Peering through the peephole of a 25-ton electric furnace in which high quality alloy steels are being refined. Only with dark heavy glasses can melters study the . 1940-01-01. United States. Office Of War Information, Palmer, Alfred T.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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