A professional who tends battery of reduction pots that smelt aluminum oxide into aluminum. Respnsibilities include:

• Adds specified amounts of oxide to pots from overhead hopper, at designated time intervals, and rakes oxide over crust formed by cooling of bath.
• Observes gas flames breaking through crust, and rakes oxide or pieces of crust over flames to prevent damage to anode.
• Watches warning lights and notes color of electrolyte (solution), and breaks up crust to add oxide to bath, using crowbar or pneumatic crust-breaking machine.
• Stirs bath to eliminate gas, using rake.
• Observes instruments and turns rheostat, or repositions anode in bath, to increase or decrease current flow and regulate temperature of solution.
• May train workers in operation of reduction pots.