Schematic of a Van de Graaff Generator
Numbers in the diagram indicate: 1) hollow metal sphere; 2) upper electrode; 3) upper roller (for example an acrylic glass); 4) side of the belt with positive charges; 5) opposite side of the belt with negative charges; 6) lower roller (metal); 7) lower electrode (ground); 8) spherical device with negative charges, used to discharge the main sphere; 9) spark produced by the difference of potentials
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"Van de graaf generator."
http://en.wikipedia.org/wiki/File:Van_de_graaf_generator.svg
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