In this paper, the shock absorber with two-cylinder used them as the working fluids, in the outside cylinder there is a ring-liked gap channel around the electric pole.

Found outside Baghdad, Iraq in 1936, the Baghdad Battery is a small clay jar containing an iron rod suspended in a copper cylinder which is soldered shut and sealed with asphalt.

Each is, in essence, a layer of carbon atoms that has been coated with nitrogen-containing molecules called amines and rolled into a cylinder with the amines on the outside.