From: Mark Holm 
To: dbates59{at}yahoo.com, atm{at}shore.net
Reply-To: Mark Holm 


Don,

There are cells for 10 x 0.875 inch plate glass mirrors tabulated here.
http://www.telerama.com/~mdholm/atm/cells/index.html

The 3-point designs are not good enough, though probably better than Novak.
 4 points is maybe OK depending on your tolerances.  6 points is plenty
good.  You have to use the design dimensions specific to your mirror to get
best performance.

The 4 and 6 point designs require pivoted bars in the support framework. 
They are not as hard to make as you might at first fear.

Send along the dimensions of your mirror and I will run out a Plop
optimized design specifically for it.  I need diameter, thickness (edge),
focal length, minor axis diameter of diagonal.

Few if any commercial cells are proportioned according to modern analysis. This
is a case where building your own can produce a better result than anything
you can buy.  (Disclaimer: I may not know all the commercial cells out
there.)

You can get plenty of help from this list regarding the design and
construction of your cell.

Mark Holm
mdholm{at}telerama.com

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