A professional who assists mold maker in forming molds used in casting copper. Respnsibilities include:

• Measures and marks pouring level on insides of mold to obtain castings of specified weights, using rules or gauges.
• Sprays inner surface of iron plugs with lampblack to prevent copper from adhering to them.
• Fastens plug in bottom of mold with locking pin.
• Sprays molds with steam or hot water to heat them to specified casting temperature.
• Cleans splashed copper from mold car, using hammer and chisel.
• Performs other duties as described under helper master title.