Re: [ATM] 40" mirror some ideas

["Mel Bartels" <mbartels@bbastrodesigns.com>]

> I would say, study Palomar and look into the big mirror discussions
> from the 30's and the 40's.  Old technology that got the job done.

David is absolutely on the correct track here.  Get a 40 inch x 8 inch thick 
primary, and have it sand blasted/cored/whatever to create a cellular 
pattern on the backside with a 1 inch thick face plate.  That way you'll 
have the flex of a 20 inch x 2 inch thick, yet the weight will (only) be, 
oh, 6x greater than that of the 20 inch.

In otherwords, get rid of the deadweight glass that is doing you no good, 
and causing an engineering trainwreck with a he-man mirror cell and the 
required humongous mounting.

Mel Bartels 

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