Cuneus and Muschenbrock
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
Muschenbrock got such a shock out of the first
jar he experimented with that he nearly died.
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.