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    Re: Battenberg Course Indicator
    From: W F Jones
    Date: 2006 Mar 5, 17:15 -0500

    Apparently provides a rapid graphical solution for mathematical problems that were
    difficult to solve in a timely manner without a computer.
    I have also seen the three-arm protractors (station keepers) on ebay relatively often
    and think about how these could be replaced with a computer program.  Two
    bearings are taken on three  land-based objects resulting in a fix.  Anyone know of a
    mathematical solution?
    Rochester, NY
    Date sent:              Sun, 5 Mar 2006 13:13:17 -0800
    Send reply to:          Navigation Mailing List 
    From:                   Paul Hirose 
    Subject:                Battenberg Course Indicator
    I came across this by chance while prowling the Internet. "The
    Battenberg Course Indicator was invented in 1892 by Captain H. S. H.
    Prince Louis of Battenberg, G.C.B., afterwards Admiral-of-the-Fleet
    The Marquess of Milford Haven, P.C., G.C.B., G.C.V.O., K.C.M.G., LL.D.
    It is practically the mooring board in mechanical form, and is
    designed for the rapid solution of a series of ordinary speed and
    distance triangles frequently met with in fleet work."
    To me the instrument looks like a mechanization of the maneuvering
    board. It has arms and sliders on which you set up the inputs and read
    the outputs. "Owing to the small inaccuracies inseparable from an
    instrument built with moving parts on robust lines, the answers
    furnished by individual instruments will vary slightly."
    (This consists of scans of the instructions, and photos showing the
    setups for several example problems. It must total a couple meg, so
    there will be a delay with a dial-up connection.)
    There are several other interesting links at the parent site. "Boxing
    the compass, points of the compass", etc.
    I found the 1908 document "Coaling from a Collier" interesting, though
    the instructions were about 70% incomprehensible due to the thicket of
    terminology. Good grief, what a detestable task coaling must have
    been! "The first maxim in coaling should be to get every single
    officer and man that can be spared, into the collier to dig out the
    coal... You will find at the commencement of a commission, that there
    are various ratings who look upon it as a right to be excused coaling.
    Meet them with a stony eye, and say there is no such thing as 'having
    a right' when the coal has to come in."
    The author, Christopher Cradock, commanded the small British force
    that confronted von Spee's powerful squadron in the battle off Coronel
    in 1914. He was killed when his cruiser HMS Good Hope blew up.

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