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    Navigation News book review on Earth's magnetism.
    From: George Huxtable
    Date: 2005 Oct 9, 12:12 +0100

    "Navigation News" is the chatty journal of the Royal Institute of
    Navigation, which appears in alternate months. Don't confuse it with their
    more formal and academic "The Journal of Navigation", which appears three
    times a year.
    The September / October issue of 2005, contains a book review by David
    Page, which may be of interest to Nav-l readers.
    It refers to "Earth's magnetism in the days of sail", by ARTJonkers, The
    Johns Hopkins University Press, 2003, 300 pages, ISBN 0-8018-7132-8, at
    $45., an edited version of the author's Ph D thesis, which was written in 2000.
    Jonkers has taken magnetic information from many European logbooks and
    sailing directions between 1500 and 1800. One of his observations is that
    there's a scatter in measurements of magnetic variation, with a standard
    deviation of about 2.5 degrees.
    Sounds interesting; I don't have my own copy (yet).
    Contact George at george@huxtable.u-net.com ,or by phone +44 1865 820222,
    or from within UK 01865 820222.
    Or by post- George Huxtable, 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13
    5HX, UK.

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