Drawing of the Pittsburgh Reduction Company's first cell room, circa 1886, showing the cast-iron crucibles, carbon anodes suspended by copper rods from overhead supports, and ingot molds on the floor.
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Drawing of the original Hall electrolytic cell set-up in the Pittsburgh Reduction Company plant, which shows the cast-iron crucibles, or pots, the carbon anodes suspended by copper rods from an overhead copper support, and on the floor, ingot molds.

Credit: Courtesy of Alcoa Incorporated

Charles Martin Hall discovered the electrolytic process for producing aluminum only months before Paul L.T. Heroult discovered the same process on his own in France. The Hall-Heroult process would reduce the price of aluminum by a factor of near 200. Today, more aluminum is produced than any other non-ferrous metal in the world.

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