Driven by a 0.25 H.P. Motor, volt A.C. Through a reduction gear and is suitable to carry up to 7 sieves of 6” or 8” dia. When clamped the sieve table does not rotate but is inclined from the vertical axis and the direction of inclination changes progressively in the clockwise direction. In addition to the gyratory motion of the shaker there is upward and downward movement at a frequency of 270 r.p.m.