Re: [ATM] Ultra-Thin Edge Support Idea - RE: [atm_free]ULTRA-THIN30"mirror from Hong Kong

[vorblesnak@peak.org]

By visual guess and by golly they are at most about 12 inches between
supports points on the 18 point cell.  This would mean in the center there
is glass, 3/4 inch thick or so spanning 12 inches.  I think it is probably
doable.  How much distortion is there in 12 inches of glass suspended at
the edges?

In a pie plate, (significantly lighter weight, but thinner in ratio), the
mirror is suspended from the edges with no distortion.  I think the weight
will a critical element in the success of the project.

David Davis
Toledo, OR 97391

> David,
>
> "What does 30 inches of 1 inch glass weigh?"
>
> In Pyrex it should weigh 57.0 lbs if it is 1" thick across the entire
> surface (meniscus).
>
> Thank you.
>
> Sincerely,
> Shane Santi - Owner
> Dream - Telescopes & Accessories, Inc.
> http://www.dreamscopes.com
> 610 - 365 - 2833
>
>


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