Violet wand
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A violet wand is a device used for electrics play consisting of a handle, which contains a high-voltage coil called an "Oudin coil," and several interchangeable electrodes, most commonly made of glass and filled with a gas which glows a brilliant purple in the presence of an electrical field.

One of the most common and safest of electrical play devices, the violet wand works by creating a strong static electrical field on the electrode. The violet wand feels nothing like you might expect, and almost everyone I know, including people who believe they would hate anything related to electricity, wants one once they've felt it. Violet wands are often referred to as Tesla coils, though this is technically not quite accurate; an Oudin coil operates on similar principles, but the primary and secondary windings of an Oudin coil share a common core, while a Tesla coil is air cored.

Links and references

www.violetwandstore.com/
www.violetwand.com

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