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    From: George Huxtable
    Date: 2002 May 21, 06:19 +0100

    I am acutely aware that, having supplied 4 parts of a promised series
    "About Lunars", and having promised a fifth, that final part has been a
    long time coming, and is by now well overdue.
    That final part is intended to be mainly about applying the result of a
    lunar distance measurement (the resulting GMT) or, for that matter, the GMT
    reading of a chronometer, to deduce the observer's longitude.
    It's pleasing to be able to say that the results of valuable discussions on
    this list have given me a lot to mull over and have caused more than one
    revision of my plans for part 5. But I don't really have a good excuse.
    Much of the delay has been due to distraction I have caused for myself,
    such as the "cocked-hat" episode. Sorry about that.
    So if anyone is still awaiting the winding-up of "About Lunars", do not
    despair. It will come, but not sure exactly when.
    I happen to have a copy of "Popular Lectures and Addresses" (1891) by Sir
    William Thomson, the Scottish physicist, later Lord Kelvin of Kelvin
    Compass, and Kelvin Sounding Machine, fame. What I have is just part 3, on
    "Navigational Affairs". Thomson undertook to write a series on "Terrestrial
    Magnetism and the Mariner's Compass" for a magazine "Good Words", and the
    first part was printed in 1874. After that, five years elapsed, as Thomson
    realised there was so much he needed to learn, and so much research that
    ought to be done. It was not until five years later, in 1879, having in the
    meantime developed the compass which became adopted by the Admiralty and
    throughout the world, that Thomson felt able to complete the series in
    "Good Words".
    Now I have no wish to compare my own efforts with those of the great
    Thomson, but I can sympathise with his problem. All I can promise is that
    my series will be completed more speedily than his was.
    George Huxtable.
    George Huxtable, 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    Tel. 01865 820222 or (int.) +44 1865 820222.

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