Combined HV Coil and Cap - Comments Please

Can anyone please tell me what is happening in the video below?

They appear to be demonstrating a coil with integrated L and C.

Although foreign, they show the circuit diagram and coil in detail.

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The solder braid over the loose-wound coil is driven with HVAC. Looks like it is intended to be the primary of a Tesla coil type configuration.

How does it add capacitance? And why the angular wrap and crossover?

What is the significance of the thin rod they show later in the video?

Thanks for any insights.

Robert Miller

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Robert Miller
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