Quote:
Originally Posted by Ric
Hi Gary
I think the mirror cool down times would be in the order of a few seconds at that temperature.
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I imagine that taking a mirror from room temperature straight to -70 would result in a cracking sound. Surely that would even stress pyrex or zerodur.
I once discovered what happens when one puts too much liquid nitrogen in a nice (expensive) agate mortar and pestle. We did manage to glue it together but I never tried that trick again.