Sand-blast
The process of engraving, cleaning, boring, and cutting glass, metals, and other substances by forcing or blowing sand, emery, powdered quartz, granules of iron, etc., upon the surface by means of steam-pressure or air-blast. Corundum 1 1/2 inches thick has been pierced by a jet issuing at 300 pounds pressure. It is also used for cleaning castings, graining of zinc-plate, cutting letters on stone and glass, frosting silverware, and many other similar purposes.