> That's what they make water-cooled Ignitrons for.

Actually the relay in a car starter shoud get you going. If you immerse it
in oil it will even last a while. Make that light oil and provide for
accidental ignition.

Exploding copper is not to be taken lightly. The flying copper carries a
lot of energy besides the heat and it can do really lasting damage to
people and objects.

Peter

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