For determining stripping value of bituminous mixes having aggregate size: 1.0mm to 75 micron. A circular tray rotates in a vertical plane at a rate of approximately 100 R.P.M. by an electrical geared motor. 4 bottles of approximately 0 400 cc are mounted on this circular tray at an angle of 90 . To each other with their mouth towards center of the tray. A time switch is provided. Suitable for operation on 230 V A.C. Single Phase.