A professional who controls mixing kettles to blend explosive ingredients and produce wet priming mixture used in rim-fire cartridges. Respnsibilities include:

• Carries prescribed quantities of dry powder, ground glass, liquid gum, and other ingredients from storage house to control house.
• Measures and mixes specified amounts of ingredients in rubber basin, using rubber spatula.
• Carries initial mixture to isolated mixing house and scoops it into mixing machine.
• Returns to control house and starts mixer, using switch on control panel.
• Stops mixer at designated intervals to add ingredients and to examine mixture to detect degree of dryness, adding water as required to prevent ignition of mixture during blending.
• Scoops blended mixture into rubber containers (boats), marks boats with identifying data, and carries them to storage house.
• Washes equipment and premises to prevent accumulation of explosive material.
• May prepare ingredients for blending.