A professional who tends drying cylinder and hammer mill arranged in tandem to dry and pulverize mica. Respnsibilities include:

• Turns valve to start flow of oil in burner and ignites oil to heat drying-cylinder.
• Starts machines that tumble mica in heated cylinder and automatically feed dry mica into hammer mill.
• Examines pulverized mica for discolorations caused by excess heat and for conformance with grinding specifications.
• Adjusts controls of drying cylinder to regulate temperature and replaces worn hammers to grind mica to specifications, using handtools.
• Changes screens on discharge chute of hammer mill according to size specified for mica.
• May fill machine hopper with mica, using tractor equipped with scoop.