"Steel manufacture, Allegheny-Ludlum. Ladling it out! These workers are casting ingots from the ladle into which a thirty-five ton electric furnace has just poured its molten steel. The ""hot tops"" allow for shrinkage of the steel in the ingots bodies. If these should be any slag left in the molten steel, it will rise into these hot tops, since slag is lighter than the steel"
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