Re: [ATM] Does glass retain moisture?

[Ken Lowther <hermit@outofoptions.org>]

Perhaps a flaw in the original, was it theory or observation, that the mirrors
were truly at equilibrium?  Really that was the first thing that came to mind
in the orginal post.

Ken


Quoting Mel Bartels <mbartels@bbastrodesigns.com>:

>> But once equilibrated, that would still result in a paraboloid shape.
>> I think we need to have regions of the mirror that have different
> coefficients
>> of thermal expansion, so that a paraboloid polished at one temperature
>> would be a paraboloid at only that temperature, in fact would be a surface
>> of revolution only at that temperature.  This should result in the
>> surface exhibiting a sort of "dog biscuit"-like lumpiness at any other
>> temperature, regardless of how well equilibrated.
>
> Have never seen this once in hundreds of mirrors that I've tested.
>
>  Mel Bartels
>
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Hermit, holed up in Youngstown, Ohio
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