The two plates are supported in two rigid uprights and driven by belt in opposite direction. They are heavy, high resistance plastic with sectors of aluminium sheet. Two Leyden jars (condensers) made from glass and aluminium foil. The whole is mounted on a wooden base nicely polished.

a) Black/Transparent plate dia. 200mm
b) Black/Transparent plate dia. 250mm
c) Black/Transparent plate dia. 300mm