"Very simple circuit, using magnet on the spark gap interacting with the coils magnetic field, and one 1n4007 rectifying diode to the cap" valllhalla@youtube

Also see these videos which might help you with recreating this device.

youtube.com/watch?v=5WWgFEETjXI

youtube.com/watch?v=mNaRe73YvVs

ebookbrowse.com/48827482-the-secret-of-radiant-energy-pdf-d366351269

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