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Re: [ATM] RC Multiple primaries and a single seconday

Do a GOOGLE on MMT and read all about it.
   
  6 Foot mirrors, millions of dollars, All the King's horses and all the King's men couldn't keep it together and finally replaced them with one large mirror.
   
  Ken Hunter
  

Scott Ewart <scotte@frontiernet.net> wrote:
  
----- Original Message ----- 
From: "Jerry Reddell" 
To: 
Sent: Saturday, September 16, 2006 12:26 PM
Subject: Re: [ATM] RC Multiple primaries and a single seconday



| One could possibly take several mirror blanks, fasten them with 
plaster(?)
| into the final desire configuration/layout and then grind, polish, 
and
| figure them as a group. I guess this could be less expensive as far 
as the
| cost of the blanks versus a single large blank. It still has some
| additional complexities and possible distortions.
|
| Jerry Reddell
|
|
The above is the only way I can think of that might make this 
work. We hear all the time about multiple-mirror telescopes, but I 
think it might be easy to forget what it takes. Don't forget that all 
mirrors must be aligned with sub-arcsecond precision and focused 
in-phase, AND able to maintain it in any part of the sky.
I don't think even plaster can do this. You're better off just 
making one mirror.

Scott


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