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 an current, which opened my eyes wide.
Link to an important Tesla document:
https://magstar.eu/wp-content/uploads/2021/11/Nikola-Tesla-On-His-Work-With-Alternating-Currents-and-Their-Application-to-Wireless-Telgraphy-Telephony-and-Transmission-of-Power-Leland-I.-Anderson.pdf
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Website with more info (check the pdf's)
http://magstar.eu/
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0:00 intro
7:14 schematic