Abstract: In a water purification cell, a silver anode and a cathode have a spacing of 1 to 4 mm. The anode surface and the rate of water flow through the cell are related according to the equation F .gtoreq. c .times. V, wherein F is the anode surface area in cm.sup.2, V is the water flow rate in cm.sup.3 /second and c is a constant of the dimension sec/cm, with a value of 2 to 5. The density of the current in relation to the area of the anode surface is between 1.5 and 3.0 mA/cm.sup.2 and the voltage is such that active oxygen is generated at the anode.

Abstract: In an induction energy transfer device comprising a static power conversion circuit for producing an alternating magnetic field of ultrasonic frequency of the type wherein the static power conversion circuit includes a parallel resonant circuit which comprises a coil which also couples power across an air gap, an improvement in efficiency and power transfer is obtained by including at least two such parallel resonant circuits in the power conversion circuit, one of which resonant circuits is tuned to the third harmonic of said fundamental frequency.

Abstract: Contaminated water is pumped through the anode compartment of an electrolytic cell which is separated from the cathode compartment by a diaphragm permeable to water and to inorganic ions. Particles of hydrophilic, electrically conductive, carbonaceous material capable of adsorbing the contaminants are retained in the anode compartment by the diaphragm and by screens in the water discharge conduit and are held in turbulent suspension by the flowing water so that they make intermittent conductive contact with the anode surface.

Abstract: Anodic disinfection of drinking water by electric current is enhanced when the electrolytic cell is divided into anode and cathode compartments by a membrane permeable to anions, the water to be disinfected is pumped through the anode compartment, and the electrolyte in the cathode compartment is enriched with chlorides, hydroxides, carbonates, or peroxides of the alkali metals, with hydrogen chloride, or with hydrogen peroxide.