One of the mysteries of the English language finally explained.
A revolving device containing an abrasive substance, in which castings, gemstones, or other hard objects can be cleaned and polished by friction.
- ‘To tumble stones: place rough rocks or minerals in the tumbling barrel, add a rough grit, and turn on the motor.’
- ‘These are complete Lortone tumbling barrels including the barrel, inner lid with liner, and the outer lid with knurled nut.’
- ‘In tumbling barrels, the friction is created by gravity as the media slides across the diameter of the barrel.’
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