Mixes plaster powder and water according to specified formula.
Places cope and drag on molding table.
Places drag half of pattern in drag. Pours liquid plaster into drag, removes excess plaster, using straightedge, and allows mold to harden. Assembles cope half of pattern to drag half of pattern in mold. Places cope on drag and makes depressions in plaster around drag pattern to ensure accurate joining of mold halves for casting. Brushes parting agent on surfaces of mold, pattern, and flask, and pours liquid plaster into cope.