From: "CSC" 
To: "Atm" 
Reply-To: "CSC" 


It is just suspicion on my part, but I use a cell now that protects the
edge.  Most cooling is now through the front surface, and there is
undetectable figure change.

Colin




Hi All

Regarding the statement below, has anyone tried insulating the edge of the
disk while the mirror to see if it retains its figure ??

Cheers
Frank Q

> overcorrect as the temperature drops.  I think it's because the edge has
> more area exposed, both from the front and side of the disk and cools
faster
> than the rest of the disk.  Sort of like a temporary Turned Down Edge, or
>

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