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    Re: Vernier explanation
    From: Gary LaPook
    Date: 2022 Jun 25, 14:17 -0700

    That's the type of scale I was asking about. I learned about it many years ago when looking into figuring a telescope mirror using a Faucault test. It was called a "BARR scale" (I mis-spelled in my original post.)   https://www.youtube.com/watch?v=RTrqI-YopBI

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