Class #5
Randolph Center Sky Clock -


  2005-2006 Mirror Making Class & Workshop 'Official Page'.

Class #5 Pics and Info
During Class

Photo by Ken Slater

The Auto Collumating Foucault Tester
The club is blessed with people like Dave Kelly (shown here testing Joyce's mirror.  Dave designed, built and improved most of this tester.  It started out very basic, and has, under his expert care, become a very impressive and easy to use tester.   Click picture to enlarge

Photo by Ken Slater
Figuring is the term that mirror makers use to talk about the parabolic shape needed for a telescope mirror.  Figuring comes from the technical term of creating a figure of rotation.  Since a parabola is only two dimensional, a parabolic mirror is like taking that two dimensional parabola and rotating it around it's center point.  This creates a parabolic bowl-shaped figure of rotation around that central point.  Click picture to enlarge

Photo by Ken Slater
Just another quick picture of me doing my figuring polish strokes.  Ken got my better side here.  Glen, the classmate in the brown shirt, finished his 10" mirror today.  It's been a long haul for him.  Good work Glen!  Click picture to enlarge

Class went well, but with some up's and down's.  I found out that my spherical shape was ok, and my TDE was gone, but when I started figuring, I created a 'hole' in the middle of my mirror.  This backed me up a little bit, as I had to re-polish it back into a sphere and start over.  Dave got me back on track again, and now I'm headed toward a parabola.  (Dave also suggested that I NOT touch my mirror until I go back to class, so unfortunately, there won't be much for post-class stuff.  I will probably play around with the tester some more, so I might be able to have some pictures from the tests.  Time will tell.  Check back again in a couple weeks, just in case.

Post Class

Nothing yet!  Check back soon!



(c) 2007 by the Randolph Center Stargazers
Site was last updated on: 02/19/2006