Ball mill
a grinding mill in which the material to be ground is tumbled in a drum with heavy b-lls of iron, steel, or stone.
historical examples
in another type of mill, called the ball mill, the principle is different.
marvels of scientific invention thomas w. corbin
noun
(engineering) a horizontal cylinder or cone in which a substance, such as a mineral, is ground by rotation with steel or ceramic b-lls
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