For determining Stripping Value of bitumenous mixes having aggregate size 1.0mm to 75 microns.A circular tray rotates in a vertical plane at a rate of approximately 100 r.p.m. by an eletrical geared motor. 4 bottles of approximately 400 cc are mounted on this circular tray at an angle of 90° to each other with their mouths towards centre of the tray.A time switch is provided. Suitable for operation on volts A.C. single phase.