Cutting and Grinding Stone, &c.

Author:  Vincent Newman
Source:  UK Patent AD 1870-No 2147
Doc ID:  1870001
Year of Publication:  1870
Abstract:  
PROVISIONAL SPECIFICATION left by the said Alfred Vincent Newton at the Office of the Commissioners of Patents, with his Petition, on the 1st August 1870. I, Alfred Vincent Newton, of the Office for Patents, 66, Chancery Lane, in the County of Middlesex, Mechanical Draughtsman, do hereby declare the nature of the said Invention for "IMPROVEMENTS IN CUTTING, BORING, GRINDING, AND PULVERIZING STONE AND OTHER HARD SURFACES," to be as follows:- This Invention relates to the cutting, boring, and grinding of stone, metal, glass, and other hard substances, by means of a stream of sand (of quartz or other suitable material,) driven rapidly against them by a jet of steam, air, water, or other suitable gaseous or liquid medium. The greater the pressure of the gaseous or liquid jet the higher will be the velocity imparted to the particles of sand, and the greater their cutting effect upon the hard substances. The harder, specifically heavier, and sharper the grains of the sand, the greater will be their cutting effect. At a higher velocity of impact the grains of the sand will cut or wear away substances much harder than the material of which the sand is composed. When the sand used is of a brittle nature, such as quartz, emery, or similar substances, the grains are broken by the shock into fine powder, and the process may thus be used as a method of pulverization. By varying the shape of the jets, and moving them or the stone, cuts or holes of any shape or size may be made.