[ATM] Re: Second Thoughts on Mirror Support

[tkrajci at san.osd.mil (tkrajci@san.osd.mil)]

>From: "Don D'Egidio" <djd521@comcast.net>

>I have a Discovery 17.5" TD dob that has the mirror secured with RTV. The
>mirror is 2" thick and what Discovery did was to mount the mirror on one 
>large
>plate rather than 3 plates. 

No pivots?  Just RTV bonding of one mirror to one plate...at nine points?

Got any photos or drawings of this?

>...They use 9 points to support the mirror,
>simulating three separate triangles with three support points each....

How does one rigid plate (with 9 points) simulate three triangles (3 
points each) that are free to move on pivots?  Again, I'm interested in 
seeing photos or drawings.

Tom Krajci
Tashkent, Uzbekistan