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    Re: Mark IX sextant manual
    From: Paul Brewer
    Date: 2009 Aug 17, 05:15 -0700

    The double eye piece / double timer BM version was the last one produced and 
    remained in RAF use until the 1970s for unpresurised aircraft use. The object 
    of the X2 eye piece was to increase light gathering with dim star use. I 
    think you will have found the Mk IX much better than most if not all of the 
    other sextants
    Paul.
    
    
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