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The Wimshurst machine is an electrostatic generator in the same vein of a Van de Graff but predates it by about 45 years. Instead of using a belt to create a static charge it uses contra-rotating disks with metal sectors to create the charge and Leyden jars to store the energy produced.
Plans for this machine freely available here:- http://steampunkworkshop.com/how-build-wimshurst-influence-machine-part-1
Part 1 Creating the disks and applying the metal sectors.