The first method was mechanical press, a vertical, manual operated, cylindrical (4.3 cm ID) mechanical press was constructed which have a spiral screw that convey the mass from the hoper to pressure raising area.
Thefirst method was mechanical press, a vertical, manual operated,cylindrical (4.3 cm ID) mechanical press was constructed whichhave a spiral screw that convey the mass from the hoper to pressureraising area.