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    Bygrave position line slide rule
    From: Zvi Doron
    Date: 2004 Feb 28, 16:01 -0000

    Hello,
    Henry Hughes & Son of London, England used to make a cylindrical 3 part
    position line slide rule for astro navigationsometims called "Bygrave" that
    worked on the principal of solving two right angle triangels instea of the
    complete PZX in one calculation. Francis Chichester used one on his epic
    solo flight across the Tasman Sea (1931) and Weems in his book "Air
    Navigation - British Empire Edition" gives a drawing and a few details. I
    could not find any reference to it on the web.
    Has anyone - ever used one? got one? seen one? knows if they can be had and
    for how much? Any information will be gratefuly received.
    Thanks
    Zvi
    
    
    

       
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