[ATM] practical limits of 1 inch mirror

[David Adams <elrey314159265359@yahoo.com>]

I'm doing a 16.5 inch diameter mirror of float Pryex.  It has gone well so far.
I am near figuring.  (For the second time.  I was nearly done, but over corrected,
and am now working toward a sphere again.)

David

----- Original Message ----
From: David Weinshenker <daze39@earthlink.net>
To: ATM List <atm@atmlist.net>
Sent: Tuesday, January 1, 2008 2:07:18 PM
Subject: [ATM] practical limits of 1 inch mirror


I note that Schott advertises "Borofloat" plate glass (fairly
similar in characteristics to Pyrex, but made by a "micro-float"
process) in large sheets - but only up to 1 inch thick.

Other than that, it looks like it would be excellent telescope-mirror
glass (and should certainly work quite nicely for mirrors at least
in the 6 to 10 inch range).

To what extent are larger diameter mirrors practical with 1 inch glass?

-dave w
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