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In this extra seventh session held in the McGregor Observatory, the focus was on figuring. Two more mirrors were declared done, the 4th and 5th of this class. Jay used his Ross Null test setup and showed the rest of us how it worked. Down in the bunkhouse, the grinding machine became operational (click thumbnail for movie link).
![]() 2005-2006 Stellafane Mirror Class Session 7 held on 2006-Apr-29
A Focus on Figuring Ross Null Lens in place The Ross Null lens is positioned precisely between the Ronchi Grating and Mirror.
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![]() 2005-2006 Stellafane Mirror Class Session 7 held on 2006-Apr-29
A Focus on Figuring Ross Null Setup Here is a mirror side view of the Ross Null test setup.
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![]() 2005-2006 Stellafane Mirror Class Session 7 held on 2006-Apr-29
A Focus on Figuring Fran & Dave are Done! Fran & Dave both completed excellent 8-inch mirrors (both did final figuring at home, we just confirmed their excellent work with a final test in class).
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![]() 2005-2006 Stellafane Mirror Class Session 7 held on 2006-Apr-29
A Focus on Figuring On to a 12-inch Cass With his 8-inch complete, Fran sets up his 12.5-inch Cassegrain primary for a test.
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![]() 2005-2006 Stellafane Mirror Class Session 7 held on 2006-Apr-29
A Focus on Figuring Testing Paul has his head in the test, while Jay and Fran look on.
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![]() 2005-2006 Stellafane Mirror Class Session 7 held on 2006-Apr-29
A Focus on Figuring Joyce presses her lap Joyce is figuring a 6" f/4 for a garden telescope.
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![]() 2005-2006 Stellafane Mirror Class Session 7 held on 2006-Apr-29
A Focus on Figuring Bad Lap Day Scott warms his lap. He had a "bad lap day", which is much worse than a bad hair day. His lap just wouldn't press well, and it stuck and grabbed when trying to figure. It seems to be very hard and unresponsive.
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![]() 2005-2006 Stellafane Mirror Class Session 7 held on 2006-Apr-29
A Focus on Figuring Erin is almost done. She is well into correction, and just needs to bring it out to the edge a bit more to be done.
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![]() 2005-2006 Stellafane Mirror Class Session 7 held on 2006-Apr-29
A Focus on Figuring It Works! The Big Blue Grinding Machine has been brought back to life. Click to see a short movie of it running (6 Mb AVI file).
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With the good weather here, work has again begun on the Flanders Pavilion. Today we poured a concrete door sill (for a very large door), in preparation for leveling the interior floor to final grade.
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