Old Gleanings for ATM article from the '70's.

[Tony244]

Hi,

Does anyone remember an old Gleanings for ATM article from Sky and Telescope in the '70's that featured a collapsible Schmidt Cassegrain?  I believe it was built by a US Navy officer who traveled a lot.  It had no tube.  It was ingenious. Any info that anyone has would be appreciated.

Thanks, Tony

[floppygoose]

No Tony, but that sound really interesting. Do you know what sort of size it was?

Phil

[Tony244]

Actually I have been able to track down some information.  It was in the July 1973 issue, and built by a Capt. Ronald P. Walker USAF.  I can't find any reproductions of the article itself.  The title of the article was A Large Knockdown Portable telescope.  I believe it was at least 10".  He built it out of hardware store supplies; he had even built a case for it. 

[Merlin66]

I have the article in front of me.

It's a 12 1/2" Classical Cassegrain.

Very similar in concept to Henry Dall's folded Cass.

[Steve Ward]

Probably in here ... http://www.shopatsky.com/product/sky-and-telescope-july-1973-digital-issue/sky-and-telescope-digital-issues-1970-1979

Copy here ... http://www.amazon.com/Sky-Telescope-Vol-July-1973/dp/B003FZX22K

[Tony244]

Interesting.  Thanks everyone.

[umadog]

If you want large aperture and ultra-portable you won't do a whole lot better than this: http://www.sumerianoptics.com/en/ I have the 10": it works well.

[Tony244]

Wow, $3300 for a 20" Dob!  Remarkable!