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Re: Theory vs. Measurement



Tesla List wrote:
> 
> >From MALCOLM-at-directorate.wnp.ac.nzWed May 29 21:51:47 1996
> Date: Thu, 30 May 1996 14:20:13 +1200
> From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
> To: tesla-at-pupman-dot-com
> Subject: Re: Theory vs. Measurement
> 
> Hi everyone,
>              I'd just like to say that I also like to be able to do
> at least ballpark predictions for coils I wind etc. One of my prime
> motivations in writing my article (whatever its flaws) was my
> discovery of Medhurst's self-C formula for single-layer coils. While
> I've subsequently learned of my shortcomings on Tesla coil theory (one
> of the reasons I joined the list), I spent months hunting out a
> formula that I could use to _always_ design a coil for a given
> frequency. I found no such formula that worked with such consistency
> anywhere else. In fact most predicted completely incorrect
> frequencies for _all_ of my coils. In the same breath I have to say
> that Ed Harris synthesized one that works rather well.
>      Also, I found that a burning curiosity to know how things worked
> after some hands-on inevitably led to murky theoretical waters, many
> of which bore fruit. This is simply carrying on from when I wound my
> first "shocking" coil when I was 8. Valves and transistors followed
> very shortly afterward. I have always been a strong experimentalist
> and will willingly toss out bad ideas if either experiment shows them
> up or someone shows me I am demonstrably wrong. I feel I too have made
> much progress, although not without countless hours of mental
> anguish.
>      Finally, one of my hopes was that by measuring and posting data,
> others who are more mathematically astute than I would have something
> useful to work with that would ultimately be to the benefit of us all.
> 
> Many regards everyone,
> Malcolm
> 

Malcolm;

Do you have the formula to make a coil for a 3-7 HZ range?  Is there a 
variable coil from a 1 - 10 hz range.

Steve