The secondary is 2.25", and the primary is 10"...
Pictures at www.nationalvintageracing.com/temp
Curt.
--- Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>
>
>
> What is the dia. of your sec. coil??
>
> Dr. Resonance
>
> >I completed my first coil this last weekend and did
> a
> >few unusual things in the construction. The
> helical
> >primary is much larger diameter than required for
> such
> >a small primary. I used a secondary coil that I
> wound
> >in High School 25+ years ago, and intend to replace
> it
> >later with a large coil. To help comphensate for
> the
> >loose coupling I moved the primary up a couple of
> >inches. As I understand it, the maximum coupling
> >would be with the primary centered half way up the
> >seconday, but this location would result in
> >overcoupling the coil. I chose a height that I
> >beleive was a good compromise.
> >A friend with a lot of tesla experience what I had
> >done and objected. He insisted that I needed to
> "drive
> >the coil from the bottom". While tuning the coil
> we
> >ended up removing several inches of turns from the
> >bottom of the secondary coil due to his insistence.
> >Now that the coil is working, I'm considering
> moving
> >the secondary down to it's original elevation. Who
> is
> >right here? Is there a reason (other than over
> >coupling and increased possibility of arc over)
> that
> >this should not be done?
> >Thanks,
> >Curt.
> >
>
>