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: 200mmDiameter of Discharge Sphere: 100mmOverall Dimensions: 350mm x 190mm x 480mmVoltage Developed: 150kV with a short circuit current of about 3 μA (depending upon atmospheric conditions)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