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    Re: Navigational instruments at the Naval Museum in Lisbon
    From: Brad Morris
    Date: 2010 Feb 23, 19:17 -0500

    That is indeed rich!  The same slaughter of transliterated phrases occurs
    when I travel in the far east.  Always a laugh!
    Nice detective work George
    Best Regards
    -----Original Message-----
    From: navlist-bounce@fer3.com [mailto:navlist-bounce@fer3.com] On Behalf Of George Huxtable
    Sent: Tuesday, February 23, 2010 6:32 PM
    To: NavList@fer3.com
    Subject: [NavList] Re: Navigational instruments at the Naval Museum in Lisbon
    Back on Feb 15th, I responded to a posting from  Gary Lapook, in which he
    showed several interesting exhibits from Lisbon. One was-
    5. http://www.fer3.com/arc/imgx/IMGP5956.JPG .
    About which I commented- "The instrument itself, a Borda repeating circle,.
    isn't visible here, but Gary has chosen to show us the label, which states-
    "The reflecting circle (18th century). Also called the "Gunwale circle", it
    was used to find the longitude by measuring the horizontal angle between the
    Moon and the stars of the zodiac". That angle, of course, is seldom
    horizontal. I know no Portuguese, but let me hazard a guess that perhaps
    their word for gunwale may be "borda", to explain the misattribution.
    I've since checked with Google Translate, and the Portuguese equivalent to
    the English word "gunwale" is indeed, in Portuguese, "borda de navio". So
    that explains how a circular instrument, invented by Jean-Charles de Borda,
    has been labelled in Lisbon as the "Gunwale circle".
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