A type of spark gap which quenches the arc by the use of a strong magnetic field close to the arc.

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A type of spark gap which quenches the arc by the use of a strong magnetic field close to the arc.
To read more about this and other types of spark gaps, click here.
A dielectric material which Nikola Tesla often used as an insulator in his experiments. Today mica is used as, amongst other things, a dielectric in high frequency capacitors.