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A power supply composed of 1140 submarine lead-acid cells for operating split-ring plasma-arc heaters is briefly described, and its application to flight simulation is reviewed. Heavy current requirements lead to battery loading up to the limit imposed by the onset of the voltage-reversal phenomenon; the additional effect of circuit transients on arc stability is also discussed. Control equipment includes a water-cooled ballast resistor and separate switches to handle making and breaking functions. Remote operation ensures the basic safety of personnel.