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Originally Posted by asimov
If this experiment is SPECIFICALLY designed to get rid of the boundary layer, if the mirror is at ambient there IS no boundary layer to get rid of.
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well, two fold:
1. i want to get the mirror quickly cooled to ambient in less than the hour that it roughly takes (from previous experiments) and in your case 4hrs!. ie if the temp is falling throughout the night, then the mirror will mean that i can start imaging sooner instead of waiting for the mirror to catch up.
2. now that i have a hole, it should also get rid of the dew that can now have easier access to the mirror!