Formula for self C of a Coil (not Medhurst)

• To: tesla@pupman.com
• Subject: Formula for self C of a Coil (not Medhurst)
• From: "Robert Jones" <alwynj48@earthlink.net> (by way of Terry Fritz <twftesla@uswest.net>)
• Date: Mon, 24 Apr 2000 18:25:57 -0600
• Approved: twftesla@uswest.net
• Delivered-To: fixup-tesla@pupman.com@fixme

Hi all,

Does anybody have the formula or a link for the capacitance of an isolated
cylinder that is not due to Medhurst?

My suspicion is that the Medhurst formula is incorrect or it contains a
fiddle
factor. If you compare the values it generates to the C of spheres it
appears
to underestimate  C by at least a factor of 2.

I believe the formula actual produces a value that when used with the
inductance of a coil  correctly  calculates the resonance frequency but it
is not the self C of the coil.  Its just an imperical relation to calculate
Fr.
I have assumed the formula in wintesla is an accurate Medhurst formula.

Thanks in advance.

Regards Bob

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