Re: [ATM] Thermal Mass - Cellulars

["Jean-Guy Moreau" <jgmoreau@cablevision.qc.ca>]

Sorry peoples,  i forgot the .jpg in the link,
it should be

http://www.cablevision.qc.ca/astro/fused_pyrex.jpg

Jean-Guy


----- Original Message ----- 
From: "Jean-Guy Moreau" <jgmoreau@cablevision.qc.ca>
To: "Ric Rokosz" <radicell2@yahoo.com>; "Cary Chleborad" <Cary@Chleborads.com>; 
<atm@atmlist.net>
Sent: Saturday, May 21, 2005 4:51 PM
Subject: Re: [ATM] Thermal Mass - Cellulars


>
>> Jean,
>> Did you ever switch to pyrex instead of plate??
>>
>> Ric
>
>
> Hello Ric, nice to hear from you.
>
> I am sure you went through the same frustration as me with
> the lightweight blanks  ;-))
>
> Yes, i can do them with pyrex and i would even say they are "cute"
>
> http://www.cablevision.qc.ca/astro/fused_pyrex
>
> BUT the cost of pyrex or borofloat sheeting is, well, astronomical...
> someone knows a decent source ?
>
> The Palomar (pyrex) syndrome is burned in our collective mind forever.
>
> For the non initiated : it does not matter the material coefficient of thermal 
> expansion,
> IF the mirror can reach thermal equilibrium with ambient air, and is then
> in a isothermal condition (same temperature throughout its mass)
>
> Jean-Guy
>
>
>
>
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> 

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