This paper describes the new type Solion Triode whose electrode gap is controlled by the electrodeposited (or electrodissolved) metal on (or from) one electrode of the two.

In this paper, the electrochemical device is introduced, the behavior of which is suggested by the chronopotentiometry. A sudden increase in resistance of the device occurs after some charge passes through the device. This novel device inexpensively constructs a ULF rectangular waveform generator together with one O. P. amplifier and three resistors only.