A professional who tends kettles that boil soap ingredients. Respnsibilities include:

• Opens valves to admit alkali, fat, tallow, lye, and steam into kettles.
• Observes temperature gauges and rate of boiling and turns valves to regulate temperatures.
• Draws samples and delivers them to laboratory.
• Adds soda and water, according to instructions, to bring mixture to specifications, using scoop and hose.
• Opens valves to drain off glycerine, water, and sludge.
• May stir soap solutions with wooden paddle to promote blending.