Shaker attachement

An orbital shaking device for use with a magnetic stirring device having a driving magnetic field means characterised in that said orbital shaking device comprises a base structure and an outer element disposed in substantially parallel alignment relative to each other, said outer element having a driven magnetic field means associated therewith and wherein each of said outer element and said base structure is provided on opposing surfaces thereof with support means supporting the outer element and the base structure to allow orbital movement of said outer element relative to said base structure, and further comprising reduction gearing means connected to the outer element and magnetically coupled to said driven magnetic field means for being driven by said driven magnetic field means to increase the torque applied thereto the arrangement being such that orbital movement of the outer element is effected by said magnetic coupling of the driven magnetic field means of the outer element to a driving magnetic field means of a magnetic stirring device.