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    Position Line Slide Rules: Bygrave, HR1, HR2, MHR1
    From: Ronald van Riet
    Date: 2008 Sep 30, 00:24 -0700

    Just over a week ago, I presented a paper on the Bygrave and HR series
    at an international meeting of slide rule collectors. Because the
    Bygrave has been discussed several times in this newsgroup as well, I
    thought it would be useful to make it available to all group members
    here as well.
    
    The pdf can be found at http://fer3.com/arc/img/PositionLineSlideRules.pdf
    
    Please note that I have tried to keep the discussion of celestial
    navigation to the minimum necessary to understand the operation of the
    Bygrave, so it is from a navigation standpoint highly incomplete and
    possibly incorrect, but please bear in my mind that the target
    audience was slide rule collectors, NOT navigation enthusiasts.
    
    I do hope many of you will find this paper interesting: if you have
    any additional information, such as serial numbers of items in your
    possession, please send them to me off list to be included in future
    versions of this paper.
    
    Ronald van Riet
    
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