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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