Nikola Tesla's patent 512340 describes his bifilar coil. It's fields are rather unique, as the coil also behaves as a capacitor. In this video, the magnetic and the dielectric field are visualized, and explained what is so unique of this bifilar coil.
link to patent:
https://teslauniverse.com/nikola-tesla/patents/us-patent-512340-coil-electro-magnets
link to the radiant power circuit video:
https://youtu.be/1Flj1i0zQ-8
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