A professional who supervises and coordinates activities of workers engaged in extracting and refining grease produced by cooking glue stock and in converting tankage to fertilizer. Respnsibilities include:

• Estimates weight and type of tankage or grease in process and specifies amount of acid to be used.
• Examines refined grease to ensure specified level of clarity.
• Directs blending of grease according to formula and loading of grease into tank cars.
• Records amounts of grease refined, blended and shipped, amounts of acid used, and moisture content of each batch of fertilizer.
• Trains workers in operation of cookers.
• Performs other duties as described under supervisor master title.