Nikola Tesla's EXTRA Coil - heat being produced!

Nikola Tesla's Extra coil, was used in his Colorado Springs experiments, and in his Wardenclyffe Tower. But what purpose dit it serve? I series connected an extra coil to my secondary, and measured voltage and current, which opened my eyes wide.

(Youtube Link)

Link to an important Tesla document:

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@Soretna , fascinating research indeed , thanks for sharing !


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