The Laboratory Pulveriser is a disc type grinder designed for grinding virtually any material to produce a fine mesh sample in one operation. The pulveriser is adopted for use in assay offices, metallurgical, aggregate, quarry, chemical and industrial laboratories. It is a self-contained grinder furnished with rotating disc having a planetary movement in a vertical plane. This feature gives added life to the wearing parts and delivers a product of uniform fineness. The pulveriser will reduce a 1 pound sample of quartz type material to 100 mesh above in 1 minute. Maximum feed size 6 mm.Grinding is done between two discs, one of which is stationary and the other revolving accentrically at high speed. The apparatus is supplied with heat treated disc 175 mm in diameter. Adjustment for size of product may be made by use of convenient hand wheel when the machine is in operation or at rest. A self-locking device holds the hinged grinding chamber in place and affords easy and quick access to the grinding chamber for removal of ground samples and for cleaning. The pulveriser is supplied with a 3 h.p. electric motor. V-belt drive. Working on 440 volts, 3 phase A.C.