antik.it/Antique-measuring-instruments/6264-Electrostatic-machine/
27102006161636734Code 6264 Electrostatic machineElectrostatic old machine, without glass disc. Signed CM, about 1880. Height cm 36 - inches 14.17, width cm 32 - inches 12.59.
An electrostatic generator, or electrostatic machine, is a mechanical device that produces high voltages with currents with very low intensity. The first generator of this type was built in 1663 by the German physicist Otto von Guericke, in order to demonstrate that electric charges of equal sign repel each other. The device consisted of a large glass sphere and inside it was housed a ball of sulfur mounted on a pole. Putting in rotation the outer sphere by means of a lever, the friction between the two spheres generated static electricity. The inner sphere could also be removed and used as a source of electrical charge for conducting experiments with electricity.
The type of machine shown here was created by James Wimshurst, British inventor and engineer, about 1880. Widespread and still used today for educational purposes, it is formed by two discs, which have narrow sectors of tin foil glued along the circumference, which are rotated in the opposite direction through a system of pulleys and drive belts. On both sides there are conductors, ending with wire brushes that rub against tin sectors. The charge is induced on two manifolds curved and it is then stored by a pair of bottles of Leiden connected to two sliding electrodes.
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Code 6264 Electrostatic machine
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