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    Re: Position Line Slide Rules: Bygrave, HR1, HR2, MHR1
    From: Ronald van Riet
    Date: 2008 Sep 30, 23:54 -0700

    I have received several reactions commenting on the discussion of
    celestial navigation, while I thought I had made it clear that this
    part was never meant to be correct or complete.
    Please, if you are familiar with celestial navigation, DON'T read this
    part or at least DON'T react: I know the shortcomings in this part and
    they were only to keep the discussion as short as possible (and to
    keep the drawing from being too cluttered).
    I had hoped that the discussion of the Bygrave and HR Series would be
    of interest to many of you, which is why I uploaded it in the first
    place, so if you have any comments on THOSE parts, by all means, drop
    me a line.
    On Sep 30, 9:24�am, Ronald van Riet  wrote:
    > 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 athttp://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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