The Shaker reproduces both circular and tapping motion, Produces Circular (280-320 RPM approx.) and tapping (140-160 RPM approx.) motion with a uniform mechanical action which ensures accurate and dependable test results. This shaker is heavy in construction and no special foundation is required. The running parts operate in oil. A 1/4 H.P. electric motor runs the machine, the machine can accommodate six test sieves + set of Lid-pan.