This strange looking apparatus is my homebuilt foucault tester. There is a wonderful (albeit long) video on this website that explains just how to use this tool.
http://stellafane.org/tm/atm/test/overview.html
The plans for this tester are not my own, and are found on stellafane.org as well.
Once our mirrors are polished and ready for figuring we will use this tester to track the actual deviation from spherical shape.
Very nice. Good job.
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