A professional who tends machines that mix flue dust and milk of lime to facilitate reprocessing in copper smelter. Respnsibilities include:

• Starts screw conveyor and opens valves and hopper gate to start flow of lime solution and flue dust into mixer.
• Starts mixer, observes mixture for consistency, and adjusts flow rate to attain specified consistency.
• Stops flow of ingredients into mixing tank, and draws sample for laboratory analysis.
• Starts pump to transfer mix to filtering process.
• Cleans mixer after each batch.
• Records number of mixes, test results, and amount mixed on production forms.