A professional who tends machine that tests hard felt sheets for uniformity of thickness. Respnsibilities include:

• Turns setscrews to set recorder dials and feed rollers for specific thickness of felt.
• Starts machine and guides felt between feed rollers.
• Observes recording dials to ascertain that felt thickness registers within allowable limits and rejects sheets not meeting specifications.
• Labels piles of accepted and rejected sheets.
• May reduce thickness of sheets, using drum-type sanding machine.