sandjet (sandjet)

An apparatus whereby sharp sand is fed to a jet of compre ed air or a steam-jet, and driven out forcibly against a surface which it is desired to abrade. It has within a few years been extensively applied to the orna mentation of gla , and to some extent in the operations of stone-cutting and the smoothing and cleaning of cast iron hollow ware. In the ornamentation of gla , stencils are placed upon the surface, which protect from abrasion the parts covered, and the abraded parts take the form of the pattern cut in the stencil. A very short exposure to sand-jet produces the tracing of a fine-frosted, well-defined gure he effective tern i the jet when air or steam at high pre ure is used renders it competent to cut and drill even corundum. The results attained, when the simplicity of the means employed are considered, render this one of the most interesting of modern inventions. See sand -blast.