In fact both shape and size are practically unlimited, being arranged to meet each specific application. Examples of round, cardboard encased dry electrolytic capacitors. Examples of round, aluminum can encased dry electrolytic capacitors. Examples of standard rectangular, cardboard box encased dry electrolytic capacitors. Metal containers, both round and rectangular, are also in common use.
Typical illustrations follow.
This stud is threaded in order that the entire assembly may be mounted vertically on a metal plate or radio chassis. The anode tab has a hole in it and through this hole passes an aluminum rivet, the other end of which is riveted or swaged over to hold in turn a solder lug for external electrical connection. The cathode foil tab is usually connected to the can by crimping it under the rim of the can. This same construction is also employed for multiple section capacities with either solder lug terminals or flexible wire leads. When the container is made of aluminum it is not necessary to insulate the capacitor proper from the container, provided that circuit requirements are such that the container can be the negative or common negative terminal, in the case of a multiple section.