Turns valves to allow solutions to flow into mercerizing, neutralizing, and finishing vats. Mounts balls of warp yarn in creel, using hoist or lift and aid of YARN-MERCERIZER-OPERATOR HELPER (textile). Ties ends of warp to leader, starts machine, and observes movement of warp through baths to detect breaks or tangles. Pulls broken yarn from vat, using hook, and ties ends. Tests caustic solution, using hydrometer, and adds water or caustic to restore solution to prescribed strength. Adjusts controls to regulate water and drier temperature and speed at which yarn passes through machine, according to yarn type. May tend discharge end of drier and observe yarn passing through $T3swing-folding attachment$T1 into handtruck, boxes, or cans. May oil and make minor adjustments and repairs to machine.
