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    Sextant mirrors
    From: Jim Martin
    Date: 2007 Oct 08, 17:54 -0700

    Issue 96 of the Nav.Found,newsletter has an article concerning
    mirrors.In which the author suggests that in an emergency the mirrors
    may be replaced,using any type of mirror available e.g.vanity,hand
    etc.It is my understanding that sextant mirrors are manufactured from
    an optically flat material,which to me means that not only the two
    sufaces be  flat but,also the refractive index.Is this correct.I have
    read that using ordinary glass results in multiple images.
                                Jim Martin.
    
    
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