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    Re: Galilean eyepiece description?
    From: Bill Morris
    Date: 2021 Apr 24, 22:20 -0700

    Paul, I give a fair amount of detail of the Coutinho pattern sextant telescope here: https://sextantbook.com/?s=Coutinho-pattern  The central slice of a lens is to bring the bubble into focus at the same time as observing the body at infinity.. I describe an earlier pattern of bubble sextant, which uses half a lens to bring a single level vial into focus, here:https://sextantbook.com/?s=Byrd

    Kind regards

    Bill Morris

    Pukenui

    New Zealand

       
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