Made of brass, interchangeable on pillars, fitted with insulators' of ebonite, Sphere 5 cm. dia., Cylinder 12.5x5 cm. dia., Cone 10x 5 cm. length x diameter.
To show that the charge transferred to a conductor resides on the external surface of the conductor. Consist of pair of Brass hemisphere 50 mm diameter, fitted with insulating handles, hollow sphere with a hole in the centre mounted on a insulated stand.