JAR MILLS
ca: MOLINS
es: MOLINOS
Jar mills are for grinding minerals, oxides, glazes, colors, etc. It is a round, porcelain tub, which can have a door or lid that must be watertight when closed. The jar holds pebbles or prepared ceramic balls, the materials to be ground and water, leaving enough space for the pebbles to fall continuously on to the products being ground when the jar rotates. There are many types and makes and at one time, when a potter had to prepare everything himself, they were a must, but now they are mainly used industrially.
