Abstract

The trigatron type of spark gap and the hot-wire gap are combined into a single device in which a trigger spark is produced near a heated filament at the sparking surface of one main electrode. The breakdown voltage of the gap, when triggered, is considerably lower than the corresponding breakdown voltage for the two constituent gaps separately, provided the applied voltage is negative. By adjusting the wire temperature the range of voltage over which satisfactory triggering occurs can be controlled, without the need to adjust the gap spacing.

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