Re: Speculum metal mirrors

On Wed, 17 Aug 2005 22:34:29 GMT, Terry A Haimann <terry@xxxxxxxxxxxxxx>
wrote, in part:

>I would advise against a speculum mirror for anything but historic
>romanticism. They had to be polished weekly I believe.

And they are not that reflective. But wouldn't it be easier to plate a
speculum metal mirror with aluminum than to aluminize glass?

Although I learned recently that today's hard drives no longer put a
magnetic coating on aluminum - they put it on glass. Perhaps the higher
thermal conductivity of metal is a problem - but the main benefit of
glass is probably that it takes a higher polish than metal.

John Savard
http://www.quadibloc.com/index.html
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