An Etymological Dictionary of Astronomy and Astrophysics

An early form of → capacitors which is a glass jar coated inside and outside about half way up the side with metal foil. A chain connects the inner coating to a rod which usually terminates in a small brass knob. The jar is charged by connecting the knob, that is the inner metal coating, to a charged body, meanwhile grounding the outer coating. Same as Leiden jar

Etymology (EN): Named after Leyden (Leiden) the city where it was invented by the Dutch scientist Pieter van Musschenbroek in 1745,
independently from the German Ewald Georg von Kleist; jar a usually “cylindrical vessel,” from M.Fr. jarre, from Provençal jarra, from Ar. jarrah.

Etymology (PE): Botri, → bottle.