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    Re: Sextant design. [was: Another Davis...}
    From: Fred Hebard
    Date: 2003 Mar 3, 21:24 -0500

    George Huxtable wrote:
    
     >1. Why does a split-horixon mirror have a piece of plain glass
    alongside
      >the mirrored part, for the horizon to be seen through? Why not just
    chop
      >that part off? What good does that plain glass do? I've asked that
    question
      >before, and ask it again in the hope of getting further answers.
    
    George, I have a Davis with the chopped off horizon mirror, which makes
    it much more difficult to use than my Husun, which has a half-silvered
    horizon mirror.  In the Husun, there is some illusion (?, or perhaps
    reflection from the front of the mirror) of the two images becoming
    superimposed, rather than split in half. Also, the edge of the chopped
    mirror in the Davis divides the field of view, making it more difficult
    still to match up the two images; they are separated by a thick line.
    
    Fred
    
    
    

       
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