From: hermit 
To: Tom Krajci 
CC: atm{at}shore.net
Reply-To: hermit 


I know of one person that had problems when his cell warped.  It wasn't a
question of being able to see Jupiter, it was a question of how many.
;-)

Ken

Tom Krajci wrote:
>
> >From: "Kristopher Barrett" 
>
> >I wonder how well a giant 1 point RTV blob would work on a big mirror?
> Has
> >anyone even tried it?
>
> I have not tried it.
>
> As I stated recently, I'm concerned that you can no longer cool the back
> side of the mirror...so that is one issue to properly address.
>
> Second...what about differential expansion of the mirror, the RTV, and
> the backplate (aluminum? steel? Other?)  You will probably have some
> interesting changes in the figure as temperature changes.
>
> Third...that big hunk of RTV...will cure due to exposure to air.  The
> edges of the RTV will cure...the center will cure very slowly, or not at
> all.  I wonder how the stresses of RTV curing over a long time period
> will change?...will this also tend to change the figure over time?
>
> Good luck,
> Tom Krajci
> Tashkent, Uzbekistan
>
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