A professional who tends tanks that recover caustic soda from solutions used in viscose rayon production. Respnsibilities include:

• Turns valves to admit impure soda solution to outside section of tank and water to inside section, effecting absorption of soda into water by osmosis through cloth membrane separating sections.
• Turns valves to regulate discharge of resulting pure soda and intake of impure soda, according to level of solution in tank sections.