A professional who tends wet end of machine that cuts and paints wallboard, as directed by fourdrinier-machine operator. Respnsibilities include:

• Turns valve to regulate flow of paint onto wet board.
• Turns handwheel to adjust cutters.
• Guides end of wet-board mat from pressure rolls onto tipple rolls at start of each new run.
• Observes wet-board panels and pulls lever to drop defective boards into recovery box.
• Sharpens and cleans cutter as it rotates.
• Removes and replaces screens and pressure rolls, using hoist and handtools.
• May weigh sample of wet board, dry sample in electric retort, and compute moisture loss and estimated density, using standard conversion tables or slide rule.
• May measure thickness of board, using calipers.
• May record production data in logbook.