From: "Dwight K. Elvey" 
To: atm{at}shore.net
Reply-To: "Dwight K. Elvey" 


Hi
 Before getting too excited about a 36", check
to see what the Sagitta will be. Unless you are making a high f-ratio, you
may find that there just isn't enough glass. Even for a 14", 3/4 is a
little on the thin side.
 Richard Schwartz sags glass in a kiln but I don't
know if he has a form or room for a 36". That is the only way a
practical 36 can be done with a 3/4" piece of glass.
Dwight


>From: "Bob Walker" 
>
>I have just obtained an interesting piece of glass.  It's nice plate glass
>36" in diameter and 3/4" thick with a well finished edge ...
okay, it's a
>table top.  The question is, what should I do with it???  The obvious first
>choice would be to make a 36" mirror out of it.  From my readings on the
>List and elsewhere, I tend to think this is impossible.  But, the hope that
>springs eternal and all that impels me to ask, has anyone tried it?  What's
>the biggest 3/4" mirror you know of? (Successful one, that is!  Mel?)
>Another intriguing thought is grinding four 14" or so off-axis mirrors out
>of it.  That has the advantage of being feasible, at least marginally so.
>Then, of course, it could just be chopped up into a number of small
>blanks -- seven 11 inchers or five 12 inchers plus a 10" ... etc etc.  Any
>suggestions on practical ways to proceed will be welcome.  I've got plenty
>of time to mull this over; I don't expect to have my current projects
>completed for a year!
>
> *  Best regards, Bob
>*
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