Introductory material

Classification—mechanical rectifiers—essential features—construction—application—electrolytic rectifiers—principles of operation—Mohawk rectifier—the term "valve"—metals for electrodes—electrolyte—Nodon valve—Audion valve—Buttner valve—Churcher valve—De Faria valve—Fleming oscillation valve—Grisson valve—Pawlowski valve—Giles electric valve—Buttner valve—mercury vapor rectifiers—principles—the terms "arc" and "vapor"—three phase mercury vapor rectifier—construction—auxiliary apparatus—series mercury arc rectifier—dissipation of heat from bulb—replacement of bulb—advantages of rectifier—precautions in installing—electromagnetic rectifiers—construction and operation.