An electrolytic corrosion associated voltage integrating apparatus comprising a first terminal to be connected to an electric conductor, such as a gas pipe, water pipe, telephone cable or the like, installed in electrical contact with the earth and a second terminal to be connected to an earthed reference electrode; a solid state electrochemical potential memory device which exhibits a terminal voltage between an anode and a cathode linearly changing as a function of the charging or discharging quantity of electricity fed to the device and which is capable of holding the terminal voltage, said device being connected to the terminals to receive an input therefrom; a reference voltage source for compensating the said conductor-to-earthed reference electrode potential input for a potential difference developed between the said earthed reference electrode and the earth per se; and means for displaying the terminal voltage of the device. A preferred embodiment of the present invention comprises means for adjusting the reference voltage of the said reference voltage source. The value indicated by the said displaying means is qualitatively associated with an amount of electrolytic corrosion occurring in the conductor during the time period when the apparatus is connected to the conductor and the earthed reference electrode.

A lithium battery is provided with an energy monitor that continuously inates the energy remaining in the battery. An electrolytic coulometer is connected in series with the battery and has a cantilevered cathode which increases its mass in proportion to the total amount of current that flows from the battery. Since the mass of the cathode and hence its resonant frequency changes in proportion to the total current, a mechanical transducer in contact with the electrolytic coulometer causes the cantilevered cathode to resonate at different frequencies which is monitored to provide a continuous reading of remaining battery energy.

An automatic tuning apparatus, such as an automatic channel selector as incorporated in a television receiver, comprising a tuner using a voltage controlled variable capacitance diode such that the variable capacitance thereof constitutes a portion of a tuning circuit of the tuner for changing the tuning frequency thereof, and a solid state electrochemical potential memory device, an output voltage of which is applied to the capacitance diode in a reverse direction, which memory device is controlled so as to be charged or discharged in response to selective manual operation until an increased or decreased terminal voltage thereof decreases or increases, respectively the capacitance across the diode and thus increases or decreases, respectively the tuning frequency of the tuner and a particular frequency is tuned. An intermediate frequency output, obtained as a result of tuning, is used to disable the abovementioned charging or discharging operation of the potential memory device.

An automatic tuning apparatus, such as an automatic channel selector as incorporated in a television receiver, comprising a tuner using a voltage controlled variable capacitance diode such that the variable capacitance thereof constitutes a portion of a tuning circuit of the tuner for changing the tuning frequency, and a solid state electrochemical potential memory devices an output voltage of which is clamped as selected by selective manual operation, the resultant voltage being applied to the capacitance diode in a reverse direction, which memory device is controlled so as to be charged or discharged in response to selective manual operation until an increased or decreased terminal voltage thereof decreases or increases the capacitance across the diode and thus increases or decreases the tuning frequency of the tuner and a particular frequency is tuned. An intermediate frequency output, obtained as a result of tuning, is used to disable the abovementioned charging or discharging operation of the potential memory device.

An electrolytic corrosion measuring apparatus comprising a first terminal to be connected to an electric conductor, such as a rail of electric railways, water pipe, gas pipe, telephone cable, power cable or the like, installed in electrical contact with the earth and a second terminal to be connected to an earthed reference electrode; a solid state electrochemical potential memory device which exhibits a terminal voltage between an anode and a cathode linearly changing as a function of the charging or discharging quantity of electricity fed to the device and which is capable of holding the terminal voltage, said device being connected to the terminals to receive an input therefrom; an amplifier for amplifying the terminal voltage of the device; and a meter for displaying the output of the amplifier. A preferred embodiment of the present invention comprises two sets of such memory device, amplifier and meter: one being for a positive going component of the input and the other for a negative component. The value indicated by the meter is associated with an amount of electrolytic corrosion occurring in the conductor during a time period when the apparatus is connected to the conductor and the earth, and thus affords a qualitative measurement indication of the amount of electrolytic corrosion so occurring.