# Re: Sphere/Toroid Comparison Chart

```Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-uswest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi Matt,

The toroid C value is obviously calc'd in these (standard toroid equations)
as well
as the spheres. But there is a problem with some. Toroid cord and diameters
overlap
on some which is impossible and the equation is then wrong for those
toroids (and
also wrong for the equiv. spheres). For example, the 8" x 6" toroid. The
cord is 6",
and therefore the outer diameter must be larger than 12". This is why the
capacitance
is way off on these particular impossible toroids.

Take care,
Bart A.

Tesla list wrote:

> Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<Mddeming-at-aol-dot-com>
>
> Hi All!
> I found this on an old paper spread sheet. No reference as to source. I think
> the relative sizes are right, but can't swear to it.
> C-C          Chord Nom.
> Toroid     Toroid        Cap       Equiv.Diam. Equiv.Diam.
> d1(inches) d2(inches) pf         sphere (in.)  sphere (m)
>
> 8                4.00 7.723         5.47 0.1390
> 8               6.00 4.540         3.22 0.0817
> 10               4.00 10.675         7.56 0.1921
> 10             6.00 8.243         5.84 0.1484
> 12                   4.00 13.262         9.40 0.2387
> 12            6.00 11.585         8.21 0.2085
> 14            4.00 15.574         11.04 0.2803
> 14                   6.00 14.605         10.35 0.2629
> 16             4.00 17.675         12.53 0.3181
> 16                6.00 17.359         12.30 0.3125
> 18                4.00 19.607         13.89 0.3529
> 18             6.00 19.893         14.10 0.3581
> 20             4.00 21.402         15.17 0.3852
> 20             6.00 22.245         15.76 0.4004
> 22             4.00 23.083         16.36 0.4155
> 22             6.00 24.444         17.32 0.4400
> 24             4.00 24.668         17.48 0.4440
> 24             6.00 26.512         18.79 0.4772
> 26                4.00 26.170         18.55 0.4711
> 26             6.00          28.469         20.18 0.5124
> 28             4.00 27.601         19.56 0.4968
> 28             6.00 30.329         21.49 0.5459
> 30                4.00 28.969         20.53 0.5214
> 30                6.00 32.103         22.75 0.5779