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A rate-of-charge method for measuring the effective leakage resistance of good quality, high valued capacitors is described. This method yields results rapidly and directly. The effective leakage resistance of various types of capacitors as a function of time of applied voltage at different temperatures was measured. A method for calculating the change in capacitance with time of applied voltage is given. A polytetrafluoroethylene capacitor had the best direct-current properties of any of the types tested.