The aluminum electrolytic condenser

In this paper the anodic film-forming properties of aluminum are discussed and the unique electrical qualities of film-coated aluminum anodes are described. Special reference is made to an aluminum electrolytic condenser of the type used in low pass electric wave-filters of direct-current telephone power plant equipment. Electrical characteristics of condensers are given and the manner is described in which the operation and life of the units are influenced by variations in composition of the electrodes and the electrolyte.