Re: [TCML] keeping primary copper tubing nice and shiny

[nancylavoie@xxxxxxxxxxx]

Aside from asthetics,this really seems to be more of a drawback in cost than anything.Silver,as stated,will tarnish and look worse perhaps than untreated copper.Nickel I would think would have the tendency to flake off as you are trying to secure it to your primary coil frame (or former) as it isn't as soft as copper.Gold would overcome these issues but come on...Clearcoating seems to be the obvious choice at the expense of the ability to make tuning adjustments later.This reminds me of a saying I used to hear from one of hotrodding friends in regards to aftermarket parts: "Chrome dosent get you home!" Wyatt
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-----Original Message-----
From: G Hunter <dogbrain_39560@xxxxxxxxx>
Date: Sun, 17 Jan 2010 08:01:07 
To: Tesla Coil Mailing List<tesla@xxxxxxxxxx>
Subject: RE: [TCML] keeping primary copper tubing nice and shiny

Gary, you are correct.  Pure silver is a much better conductor than silver oxide according to this ham radio site:

http://hamwaves.com/antennas/coils.html

Quote:

"At a temperature of 20°C (293.15K), silver (Ag) has a resistivity of 1.58·10-8Ωm, which is the lowest of all metals, and a temperature coefficient of 0.0038K-1. Silver[I] oxide (Ag2O) at this temperature has a 500 times higher resistivity of 8·10-6Ωm and a temperature coefficient of 0.004620K-1 [3]. Nonetheless it is still considered to be a conductor, whereas both copper[I] oxide (Cu2O) and copper[II] oxide (CuO) are semiconductors at room temperature."

Close quote.

Nuf said,

Greg


--- On Sat, 1/16/10, Lau, Gary <Gary.Lau@xxxxxx> wrote:

> From: Lau, Gary <Gary.Lau@xxxxxx>
> Subject: RE: [TCML] keeping primary copper tubing nice and shiny
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Saturday, January 16, 2010, 11:16 PM
> I don't think that's true. 
> Please cite a reference?
> 
> > Silver oxide is a better conductor than metallic
> silver.
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> Tesla mailing list
> Tesla@xxxxxxxxxx
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