Gyratory type shaker is driven by FHP motor through a reduction gear suitable to carry upto 7 sieves of 15 cm or 20 cm diameter. When clamped the sieve table does not rotate but it 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 an upward and downward movement ensuring that each square inch of the sieve is utilised. The whole mechanism runs in an oil bath. Test Sieves will be supplied at an extra cost. A time switch from 0 to 60 minutes is provided.