This jar used to store an electric charge is credited to both E.G. von Kleist & Pieter van Musschenbroek
[DOC] [TLE] Chronology of Communication Events: Part 1 [PAR] Aug 20, 1999 ... Ewald Georg von Kleist (1715-1759), the dean of the cathedral at Cammin in 
Pomerania (Germany), and Pieter van Musschenbroek (1692-1761), a professor 
... by a friction source can store the electric charge for later use.