10 Feb
2011
10 Feb
'11
2:06 p.m.
Hi All, I searched for an article that Bill may have written. This is all I found, a posting on Utah Astronomy in 2000 "Spherical mirrors can be used instead of parabolic mirrors in Newtonian = telescopes. The mirrors are supported on a ring at their edge and pulled = to a parabola with tension applied inside to flex the mirrors to a very = high quality parabola. The calculations for the proper distribution of = puller tension has been done by an associate of mine- Alan Adler. The = results are available in a simple-to-use form at www.seds.org/TAC . Gary = Seronik of Sky & Tel is assembling an article for publication. Kim Hyatt = has an experimental 13.1" version of this concept. I will be pleased to = respond to questions . Bill Kelley"