This hand powered Van de Graaff Generator includes a 200mm diameter metal sphere and a 100mm discharging sphere. The discharge sphere is supported on a pivoted arm with a handle and is attached to the top of the driving-wheel pillar. For connecting accessories, a 4mm socket is provided at the top of the large sphere, and a 4mm earth socket is drilled in the handwheel pillar base. Sparks in excess of 50mm in length are easily obtained at a slow rate of turning (200 rev/min) and the apparatus is tolerant of moisture and dust. Diameter of Dome: 200mm. Diameter of Discharge Sphere: 100mm. Overall Dimensions: 350mm x 190mm x 480mm. Supplied complete with instructions. A Van de Graaff Accessory Kit is available to purchase separately (B8H26746). Spares available:. Spare Drive Belts: B8R08203 - Pack of 10.