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    Re: The Observer’s Book on Astro-Navigation - Coutinho sextant
    From: Gary LaPook
    Date: 2016 May 2, 08:26 +0000

    Look at page 187 of "Precision Astrolabe" that I previously posted.
    
    gl
    --------------------------------------------
    On Sat, 4/30/16, David Pike  wrote:
    
     Subject: [NavList] Re: The Observer’s Book on Astro-Navigation - Coutinho sextant
     To: garylapook---.net
     Date: Saturday, April 30, 2016, 4:43 PM
     
     BillIt 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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