A professional who assists furnace operator by performing any combination of following duties. Respnsibilities include:

• Seals furnace opening with fire clay and firebrick, using paddle and shovel.
• Charges furnace with materials, such as scrap, ore, flux, reagents, slimes, oxides, pellets, or coke, by moving levers to open bin or hopper gates, by shoveling, or by signaling furnace charger or overhead crane operator to load furnace.
• Turns valves to force air through tuyeres into molten metal to oxidize impurities.
• Observes gauges and manipulates controls on panel to admit nitrogen to prevent igniting of magnesium.
• Stirs molten metal with green poles to prevent copper from oxidizing.
• Skims slag from molten metal, using bar, rabble, or ladle.
• Cleans slag from tuyeres to let air flow, using bar, hammer, or pneumatic drill.
• Signals overhead crane operator, or uses electric hoist, to position ladles or buckets near furnace, and moves levers to tilt furnace into pouring position.
• Scrapes and chips slag, solidified metal, furnace lining, and residue from furnace, using hammer, chisel, and scraper.
• Breaks condensers and defective retorts with sledgehammer for removal to crusher.
• Raps flues and dust catchers with bar to remove dust.
• Performs other duties as described under helper master title.