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    Re: The backstaff. was: Re: The Shovell disaster
    From: Nicol�s de Hilster
    Date: 2007 Nov 08, 08:28 +0100

    
    > Interesting.  I only knew of the method of Philippe de La Hire described
    > in Maurice Daumas' "Scientific Instruments of the 17th and 18th
    > Centuries and their Makers".  (It's a good book on general instruments,
    > including navigation - I found an English translation of the original
    > French book in a second-hand bookstore for $45 years ago - a bargain
    > considering the content and how often I refer to it.)
    >
    > La Hire uses a system based on circular arcs.
    >
    I'd be very interested in this. Found the book on Amazon for just under
    GBP25,- and ordered it straight away. Thank you for bringing this book
    to my attention.
    
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