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Throughout the 17th and 18th centuries there were several new inventions developed to measure static electricity. One of these creations was the Leydan Jar. It made up of a jar coated inside and out with foil. Then an electrode was connected to the inside foil to conduct electricity. Then the charge moves to the electrode with a generator. Another invention was the Wimshurts machine. The machine is an electrostatic generator. The generator has rotating disks that carry metal on them. If the generator is used it is through the process of induction.