1. A 25-inch Breakthrough.
- Author
-
Oltion, Jerry
- Subjects
- *
TELESCOPE mounts , *TELESCOPE mirrors , *GRINDING & polishing , *PARABOLIC reflectors - Abstract
The article discusses the innovative telescope of Mel Bartels. Topics mentioned include the elimination of Dob's hole, the gymbal lock experienced when observing near the zenith with a Dobsonian mount, in Bartels' scope, his move to polish and parabolize a mirror through using his own grinding and polishing machine, and the addition of a second axis to let him observes an object through the zenith without twisting the scope in azimuth.
- Published
- 2019