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The current‐voltage relationship for dielectric liquids consists of two portions, usually in superposition: at lower voltages a current of ions flows; at higher voltages, field emission sets in. The field‐emission current depends on the material of the cathode, but not simply on its work function. The current may be altered by changing the thickness of the cathode surface layer or the gas adsorbed upon the surface. When the ion content of the liquid is raised, not only the ionic current, but also the field‐emission portion of the current increases. Controlled field‐emission currents have been produced.