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Re: Medhurst problem
From: Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Friday, November 14, 1997 7:49 PM
To: Tesla List
Subject: Re: Medhurst problem
Hi Tristan
> From: Mad Coiler [SMTP:tesla_coiler-at-hotmail-dot-com]
> Sent: Thursday, November 13, 1997 12:47 PM
> To: TESLA-at-pupman-dot-com
> Subject: Medhurst problem
>
> Tesla List readers,
>
> I was thinking about the Medhurst formula and I problem came to mind.
> All the formulas I have seen deal with only the width and length of a
> coil. What if a coil was space wound or used insulated wire for its
> secondary windings? This should have a lower capacitance, but the
> formula would give the same value. And also, what of the diameter of the
> wire? Does it not have any effect? My first thought would be that a
> smaller guage wire with more turns would have a higher capacitance
> value. Well, I havent given it a second thought yet. Could someone set
> the records strait here?
>
> Tristan Stewart
I've found the value it gives to be unaffected by a space wind - at
least where space between turns = wire thickness or less. Haven't
tried greater spacing. Would do so on a real big coil. Small ones
suffer too much from a loss of inductance.
Malcolm