A professional who tends equipment that blends and screens dry explosive powders in cloth, cone-shaped mixing and screening device to make primer powder for center-fire cartridges. Respnsibilities include:

• Selects and carries predetermined quantities of ingredients from storage magazines and dryhouse to mixing house.
• Positions containers in specified order on dumping shelf of mixing device.
• Moves dump arm by remote control from behind cement wall to empty containers in mixing bag.
• Turns mixing crank specified number of times to move bag center up and down to blend powders, observing operations in mirrors set at angles.
• Pours blended powder into rubber containers, marks with identifying data, and carries them to storage magazines.
• Washes equipment and premises to prevent accumulation of explosive dust.
• Mends and replaces torn mixing bags, using needle and thread.
• Repairs screens and attaches bags to wall of mixing cylinder, using special lacing and tying technique.
• May blend wet mixtures.