RTV Considered Harmful (was [ATM] Re: Second Thoughts on MirrorSupport)

[mikell at optonline.net (Michael Lindner)]

On Saturday 07 February 2004 02:53 pm, Mel Bartels wrote:
> I've experimented with bending forces in thin plate and pyrex large blanks.
> I've found that a differential pressure of 1 ounce can be detected.  One
> pound of differential force makes a horrendous change in the wavefront.

Mel,

Can you elaborate? How thin and how large? How was the wavefront measured?

Ya know, I'm in the process of designing a cell for a 17.5" thin plate 
(Coulter) mirror. It seems no matter what my current ATM project is, the list 
always discusses it in a timely manner!

Clear skies.
-- 
Michael Lindner
http://www.starastronomy.org *** http://home.att.net/~mikel
http://www.atmsite.org *** http://www.atmlist.net