ABRASIVEBLASTING
Abrasive blasting
Abrasive blasting is the operation of forcibly propelling a stream of abrasive material against a surface under high pressure to smooth a rough surface, roughen a smooth surface, shape a surface, or remove surface contaminants. A pressurized fluid, typically air, or a centrifugal wheel is used to propel the blasting material . The first abrasive blasting process was patented by Benjamin Chew Tilghman on 18 October 1870.The above text is a snippet from Wikipedia: Abrasive blasting
and as such is available under the Creative Commons Attribution/Share-Alike License.