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Re: Meter Mirror Makers Club

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Posted by William Woturski on November 20, 2000 02:20:07 UTC

Rick

Back in Jan you posted a message about the Meter Mirror Club. Although
I don't qualify at this point. I am planning to build a 24". I have
some questions that perhaps you can answer. Back in 1983' in "Sky and
Telescope" I read an article on a 24" scope built with a Pyrex Conical
Mirror. I have not been able to find any further information on
whether
these make good mirrors or do they suffer from thermal equilibrium
problems due to this mirror's 3" thick center which tapers to 1/2" at
the edge. Are thinner Pyrex (~2") mirrors better because they
equilibrate faster? Are slumped mirrors better than flat and how do
you
mount the slumped one in a cell. Do you use a standard multi-point
Dobsonian cell? In my 98' Newport Catalog they do sell conical as well
as the standard flat and they will slump the thin ones for you as well.

Also in your Jan posting you mentioned -

"For those of you that would like to make a more reasonable sized scope
I am arranging for the supply of fine annealed blanks in the 16-30 inch
range and a new type of all glass tool from 8" to 30" . I will post
more
about this." Have you done any more on this?

I would appreciate any information you can give me. Thank you?
Bill

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