Re: [ATM] Mirror cell design

["Jeff Anderson-Lee" <jonah@cs.berkeley.edu>]

[Sigh.]  Yes Richard, gluing works well for standard thickness or even 
"thin" mirrors, but reportedly has problems near the horizon with 
ultra-thin mirrors.

Jeff

Richard Schwartz wrote:

>The most popular alternative to a sling is to use metal clips at the edge
>of the mirror to retain it in the cell.   If you screw those clips tight
>enough, friction will prevent the glass from sliding around or rattling in
>the cell during transport, and your scope will always be perfectly
>colimated.
>
>Whatever you do, you do not want to search the ATM list archives for any
>discussion of this.   Some crazy radicals advocate GLUING THE MIRROR INTO
>THE CELL.   If that were a good idea, the optical great masters of the
>1930's (such as John Hindle) would have discovered and used that method.  
>Any fool can see that if you glue the glass into the mirror cell it will be
>under a lot of stress when the temperature changes and the figure will be
>ruined.
>
>. . . Richard
>
>  
>
>>[Original Message]
>>From: Jeff Anderson-Lee <jonah@cs.berkeley.edu>
>>To: AMT Mailinglist <atm@atmlist.net>
>>Date: 7/20/2004 8:30:56 AM
>>Subject: Re: [ATM] Mirror cell design
>>
>>Wouter van Reeven wrote:
>>
>>    
>>
>>>So, is there an alternative to using slings? I suppose creating a ring
>>>around the mirror would not leave enough room for the mirror to expand
>>>under heat, right? How about putting a rubber ring inside a metal ring?
>>>Wouldn't that give enough support and not too much friction
>>>
>>>      
>>>
>>A rubber ring would add an incredible amount of friction. You could try 
>>wrapping the mirror with a few wraps of teflon plumber's tape perhaps.
>>
>>Jeff
>>
>>_______________________________________________
>>ATM mailing list http://www.atmlist.net/
>>    
>>
>
>
>
>_______________________________________________
>ATM mailing list http://www.atmlist.net/
>  
>

_______________________________________________
ATM mailing list http://www.atmlist.net/