RE: [TCML] Flat Spiral Primary

["Lau, Gary" <Gary.Lau@xxxxxx>]

Iron/steel and galvanized iron/steel has extremely poor conductivity as compared with copper.  High conductivity is very important in the primary circuit.  Use only copper.

Copper tubing is easily and neatly spliced if you need to extend what you have.  Just insert a ~1" long piece of clean brass #10 screw or threaded rod halfway into the two ends; heat and solder.  The screw will keep the two pieces of tubing aligned and ensure a sturdy joint.

Regards, Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Mike Thompson
> Sent: Wednesday, July 22, 2009 6:51 PM
> To: Tesla Coil Mailing List
> Subject: [TCML] Flat Spiral Primary
> 
> Hello All,
> 
>   I have been playing around with some calculations for a flat spiral primary coil,
> and it turns out that the little bit of .25 inch copper tubing I have is not long enough
> to for my needs. I was wondering what some of the draw backs of using 9 gauge
> galvenized fencing wire would be. It is cheaper and I get twice as much wire for half
> the price of copper.
> 
> Any thoughts?
> Thanks
> Mike T.

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