Ordinary methods for the production of high voltages for application to vacuum-tubes are satisfactory up to several million volts, but are subject to definite limitation due to corona or spark-over from the high-voltage terminal toward ground. A system of successive concentric Faraday cages, with the outermost cage grounded, is not so limited. An impulse-method for the production of extremely high voltages using such a system of Faraday cages is described. A system of ($2n+2$) cages gives an impulse-voltage slightly less than $\mathrm{nV}$ on the innermost cage.

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