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Foucault Testing?

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Posted by William Clark on October 28, 2001 13:40:46 UTC

Building a tester doesn't look too difficult but i'm having trouble understanding how to use it to test a mirror accurately. I have an 8 inch mirror that i can use to test.
Does anyone know of a site that can take you through the testing process with a couder mask?
Thanks for any help.

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