Nikola Tesla's EXTRA Coil

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... Donations are appreciated, click here: https://PayPal.Me/masterivo Website with more info (check the pdf's) http://magstar.eu/ Instagram:   / master.ivo   0:00 intro 7:14 schematic