Re: Is this a Wheeler coil?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Hi,

See this document and the equations for "Conical Primary" on page three.

http://hot-streamer.com/temp/FormulasForTeslaCoils.pdf

Here is a "Variometer" that uses such coils in an "accordion" stack 
for adjustability.

http://tf.nist.gov/timefreq/images/radiostations/wwvb-large/hist1.jpg

Some programs might calculate the inductance "better" if needed, or 
at least to double check:

http://hot-streamer.com/TeslaCoils/Programs/MANDKV31.ZIP
http://hot-streamer.com/TeslaCoils/Programs/MANDKV31.PDF

http://www.classictesla.com/java/javatc.html

All this is for "round" spirals.  As far as I know, the "square" ones 
are done by "trial and error"...  They are probably "close" to round 
ones in "area"...  The WWVB one is like a 50 year old salvage part 
from the Navy but I think the put new wire on it...

This "might" tell more:

http://tf.nist.gov/general/pdf/1406.pdf

There is some accuracy date here for flat primaries:

http://www.classictesla.com/sim/k.html

Cheers,

        Terry



At 04:05 PM 11/22/2006, you wrote:
> Thank you to all the helpful persons out here in "Teslaland" who 
> have provided their valuable time to assist me.
>
> >From all that help....it seems like my spiral needs are somewhat 
> different in geometry that what I had originally expected.
>
> Picture if you will a flat piece of sheet metal in the X-Y 
> plane...say a square of 48 inches x 48 inches.
> Into that sheet I need to make CUT a spiral...it can be any 'shape' 
> or geometry...but it needs to have an inductance between 3 to 10 
> microhenries...approx.
>
> It would be well if the adjoining turns are 'very close' 
> together...say 1/16 inch spacing between turns.
>
> Lastly...and if needed...turns may be at different 
> 'elevations'...such as to make a 'truncated cone" spiral extending 
> in to the Z - axis.
>
> Kinda wonder if Wheeler had this in mind when he developed his equation....
>
> Any/all help is Greatly Appreciated.
>
> Happy Holiday Season to All.
> Steve
> Email   stephentetorka@xxxxxx