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    Re: What is this on this sextant
    From: Gary LaPook
    Date: 2016 Feb 23, 14:42 -0800

    There is a discription of the Cotinho bubble sextant in this book excerpt that I uploaded before.

    gl

    http://www.fer3.com/arc/imgx/Bubble-sextants-Precision-Astrolabe.pdf

       
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