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    Re: François Coudraye, anyone?
    From: Marcel Tschudin
    Date: 2018 Jul 30, 22:55 +0300

    On 30 July 2018 at 20:15, Roger W. Sinnott <NoReply_Sinnott@fer3.com> wrote:

    A friend of mine, Rebecca Karo, is an art historian and also works as an archivist in Exeter, NH.  She wrote me with this question:


    "The American Independence Museum in Exeter, NH, has a

    letter from the Marquis de Condorcet to a royal minister

    (I have to find out who) about acquiring 600 copies of

    François Coudraye, 'Dissertation sur la manière de

    déterminer les longitudes à la mer, couronnée par la

    société des arts et métiers d'Utrecht,' 1783. He asked

    the minister to also confer with Charles de Borda,

    another interesting mariner/mathematician, about acquiring

    the book. Condorcet wrote that the book was clear and

    methodical and would be good for mariners who are unused

    to calculating their position while at sea. The book is

    small -- an octavo of 94 pages -- so it would be easy to

    take on board!"


    Charles de Borda's lunar-distance clearing method is described in the books of Cotter, and he is mentioned in connection with testing chronometers at sea in The Quest for Longitude (William J. H. Andrewes, ed.) and in The Marine Chronometer by Rupert T. Gould.


    But I can find very little about François Coudraye, although a page in the French Wikipedia confirms that he wrote the 1783 dissertation on longitude at sea: https://fr.wikipedia.org/wiki/Fran%C3%A7ois-C%C3%A9lestin_de_Loynes_de_La_Coudraye


    Does anyone here know anything more about François Coudraye (1743-1815) or his 94-page book?




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