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Cuneus and Muschenbrock, in Leyden (Netherlands), discovered the Leyden jar in
1745. The first electrical capacitor- a storage
mechanism for an electrical charge. The first ones were
a glass jar filled with water-two wires suspended in the
water.
Muschenbrock got such a shock out of the first
jar he experimented with that he nearly died.
Later, the
water was replaced with metal foils wrapped so that
there was insulation between the layers of foil-the two
wires are attached to the ends of the sheets of foil.
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