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    Re: Mark 15 sextants
    From: Roger W. Sinnott
    Date: 2018 Oct 26, 17:42 -0400

    Years ago, someone gave me an “EBBCO” plastic sextant made by the E. Berkshire Boat Co., Wargrave, Berks, UK., and marketed by Davis Instruments of Hayward, CA, USA.  Is this related somehow to the various Davis models being discussed in this thread? 

     

    Mine is well made, dated 1974, and came with excellent instructions for its use.  The only thing wrong is the filters.  It has two horizon shades and three index shades.  One horizon shade and one index shade are totally (100%) opaque when I look through them at the noonday Sun.  All the other shades show the Sun as a large green blob of glare with no distinct solar disk.  These must be fairly recent chemical changes in the filters (within the last five years, I’d say), because I took sights with this sextant as recently as 2010 and don’t recall anything funny about the filters. 

     

    Has anyone else encountered this type of problem?

     

    Roger

         

     

    -----Robert Pearson wrote----------------

    Gord, this is a Davis Instruments Prism Level which fits their Mark 12, 15, 20 and 25 sextants. . .

       
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