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Re: bipolar coil design

Original poster: "Peter Terren" <pterren@xxxxxxxxxxxx>

You can avoid primary strikes by use of a second smaller toroid below the main one. They have a marked "shaping" effect on the direction of streamers.
With single toroid: http://tesladownunder.iinet.net.au/T6_5ft.JPG
With second toroid: http://tesladownunder.iinet.net.au/Tesla_7ft.JPG

Peter (Tesla Downunder)

Original poster: "Lau, Gary" <gary.lau@xxxxxx>

Never having built a bipolar coil I can't comment based on experience,
but powering it by two 15/60's sounds like major overkill.  I should
think the primary would be an unavoidable target with such power.