Abstract: The invention relates to a spark-gap discharger triggered in a gas. The triggering discharge takes place on the edge of a thin dielectric sheet between two thin metal layers adhering to opposite surfaces of the dielectric sheet. Application to the reduction of the manufacturing cost and to the increase in triggering precision in terms of time of a spark-gap discharger.

Abstract: Shunt means supply a diode bridge with an alternating current proportional to the AC to be measured. The bridge has at least two electroluminescent diodes which emit two alternating streams of half-wave light pulses which are supplied to two fibre optic systems. These convey the light signals to a safe distance from the high tension line where two light receptors receive the respective streams of half-wave light pulses and apply electrical signals proportional thereto to opposite inputs of a differential amplifier. The output of the amplifier is a readily measurable AC. Balancing means may be provided to compensate for any difference in the overall transmission paths for the two half-wave pulse streams. A resistive load may be provided adjacent the line to sink the current flowing through the diode bridge.

Abstract: The invention relates to a new structure for a sodium-sulphur cell. Such a cell comprises a cathode tank containing sulphur, an electrolyte tube closed, at its lower end, containing sodium and immersed in sulphur, a sodium anode tank, a ceramic support holding the said tank and the tube, the cathode tank being fitted with graphite felt washers ensuring cathode collection of the current, the outside face of the electrolyte tube being, except for the lower end, lined with a porous insulating coating, a graphite felt part being, moreover, inserted between the said lower end of the electrolyte tube and the bottom of the cathode tank. The invention is implemented in sodium sulphur cell batteries for electric vehicles.

Abstract: The invention relates to a sodium-sulphur battery for electrical drive. It is formed by elements each comprising a cathode tank containing sulphur, a solid electrolyte tube closed at its lower end, containing sodium and arranged in the said cathode tank, a ceramic insulating support for keeping the said electrolyte tube in the said cathode tank, an anode tank containing a supply of sodium, that battery being characterized in that it comprises m groups of n modules each comprising p elements, those elements being electrically interconnected in parallel in each of the modules by means of plates connected to the bottoms of the said cathode tanks and anode tanks respectively, each of the said plates comprising a substantially central bore. The invention is implemented for propelling all electric vehicles.

Abstract: Zinc-air electrochemical cell comprising several elements fed with an electrolytic solution comprising zinc powder in suspension, conveyed by forced flow in the said elements, those elements being grouped together in modules, electrically connected in series and fed by the said solution also in series within each of the said modules. Such a cell comprises one or several unitary cell blocks each comprising two substantially identical modules arranged one above the other and electrically connected together in parallel, the module situated at the upper level receiving the said electrolytic solution which, after it has crossed through that module, is transferred to the input of the upper element of the second module situated at the lower level and lastly, flows out through the output of its lower element.