# RE: Sphere/Toroid Comparison Chart

```Original poster: "John H. Couture by way of Terry Fritz <twftesla-at-uswest-dot-net>" <couturejh-at-worldnet.att-dot-net>

Matt -

Your table agrees closely with a Sphere/Toroid Graph I show in one of my
books. The graph covers spheres up to 60 inches diameter and toroids up to
80 inches large diameter. We must have used the same equations. The
advantage of a graph is that if you only know the capacitance the graph will
quickly show you several different size toroids that will have the
capacitance you need and you do not have to do any calculations.

John Couture

-------------------------------

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Thursday, May 03, 2001 7:50 PM
To: tesla-at-pupman-dot-com
Subject: Sphere/Toroid Comparison Chart

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