On Fri, 17 Oct 2008 10:38:24 +0100, bugbear wrote:

> blake murphy wrote:
>> <consults google and calculator> so call it thirty bucks american? not too
>> bad. well thought-out in any case.
>
> Turns out there's a commercial version:
>
> http://bellacopper.stores.yahoo.net/index.html
>
> although what the difference between their "product"
> and a piece of copper from a metal merchant is, I don't know.
>
> I would worry that a 10" square piece of 1/8 (3mm) copper
> in the purity they state would be extremely prone
> to bending. Mine is 6mm and (happens to be) a harder grade of copper.
>
> Oh ye $DEITY!
>
> They do a silver one, which is ONLY 7% better, and is ...
> ... slightly more expensive.
>
> http://bellacopper.stores.yahoo.net/sihedidepl.html
>
> Since effective thermal conductivity is the product of area and specific
> conductivity they could offer the same performance
> by increasing the thickness of their copper product by 7% !!
>
> (mine is twice as thick as theirs, so my copper
> one is better than their silver one, and cheaper too)
>
> BugBear

it does indeed look like you got away cheaper. still, great minds and all
that...

your pal,
blake