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It is shown that the resonant properties of axially symmetric cavities can be calculated using data obtained on an analogous static system in an electrolytic tank. The electrodes simulating the cavity are split into segments to allow a measurement of the current distribution along the electrodes. This current distribution is then used to obtain an approximation to the distribution of dynamic charge density over the walls of the cavity, and so yields the current distribution in the cavity. Calculations of the cavity parameters from the estimated current distribution yield results within a few per cent of the values measured on an actual cavity.