A professional who tends clay roasting kilns and auxiliary equipment in which clay, used as filter in treating oil, is cleaned and treated for reuse.

• Adjusts temperature of rotary kilns in which clay is roasted, by regulating valves controlling gas or oil and air supply.
• Starts, stops, and regulates speed of conveyors and elevators by which used clay is charged into kilns from storage bins.
• Fires oil-burning or gas-burning steam heater to supply steam for treating clay before it is dumped from filters.
• Checks weight per cubic foot of clay to determine whether it conforms to requirements, using spring balance.
• Cleans lumps of fused clay from screens at outlet of kilns.
• Oils and greases equipment.