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    Re: The Observer’s Book on Astro-N avigation - Coutinho sextant
    From: David Pike
    Date: 2016 Apr 30, 14:37 -0700

    Bill

    It would be very useful if in addition to your other excellent photos you could get a photograph of the view of the bubbles down the eyepiece to supplement the diagrams on page 163 of 'Taking the Stars'.  Also 1, does the Coutinho require fiduciary marks for the longitudinal bubble, or is the radius of the level cunningly matched to something?  Also 2, how does the Coutinho allow for the fact that the body is focused at infinity, and the levels are about nine inches in front of the observer’s face?  DaveP

       
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