From: "Dave McCarter" 
To: "Bob May" ,
        "atmlist" 
Reply-To: "Dave McCarter" 


> What is interesting to me is that the large telescopes that have
been made
> by amateurs have all been Newts.  Considering the short FL designs
with a
> tall ladder, it is kind of odd that the makers didn't make cass.
designs.
> There's no need to perforate the primary as a tertiary flat mirror
will
> bring the focus out to the side at any appropiate height (imagine
the Yard
> Scope with an eyepiece at eye level!) that would be desired.

Reminds me of Clyde Bone's Nesmith design, where a 25 inch f5 primary fed a
6 inch parabolic secondary, into the on axis 6 inch flat, out the center of
the side bearing to another flat, and into a f5 high grade refractor. To
observe you sit behind the scope and look slightly down. The viewing
location does not change with elevation, although you do have to move
around the scope when slewing in azimuth. Very nice, but I'd not like to
think about all the reflection loss with less than perfect coatings.

Dave

--- BBBS/NT v4.00 MP