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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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