Re: Copper and silver - why the best conductivity?

I agree mirrors are sputtered Aluminum or sheet silver or my gaudy sheet gold :-)
The glass is typically, not always by any means a safety glass with an index of refraction
and absorbs producing defects.

In camera lenses they use rare earth glass to limit distortion.  I don't think
any of us could afford a half-length hallway mirror in rare earth materials.

To the eye it is close enough or fine enough to use.  Some are better.
Martin
Martin Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
NRA LOH, NRA Life
NRA Second Amendment Task Force Charter Founder



jim rozen wrote: 
In article <1130125788_883@xxxxxxxxxxxxxxxxxxxxxxxxx>, Martin H. Eastburn
says...

Jim -

Can you tell me the number of that perfect Al ?

2xxx contains copper
2xxx contains copper and Mg
6xxx contains mg and Si
7xxx contains Zn and Mg
7xxx contains Zn, Mg, Cu
5xxx contains Mg
3xxx contains Mn
4XXX contains Si
1xxx is ?pure more or less ?



Most mirrors are made with *pure* aluminum, there is no
alloying agent used.  The stuff on my shelf is 5/9s IIRC.

Jim



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