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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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    Re: Welcome to new member (and article spiegelboog)
    From: Frank Reed CT
    Date: 2006 Nov 27, 00:21 EST
    Nicolas, you wrote:
    "I would like to add to your description of my spiegelboog that, as far
    as known untill now, this instrument was the first ever reflecting
    navigational instrument using a glass mirror. It was invented in 1660
    (patent given on September 25th), which was well ahead of Robert Hooke
    (1666), Sir Isaac Newton (1699), Thomas Godfrey (1730) and John Hadley
    (1731)."
     
    Of course, the "key" principle applied by Newton, Godfrey, and Hadley was double reflection. The spiegelboog ("mirror bow"?) has only one mirror and does not incorporate that revolutionary double-reflection principle. Or did I miss something?
     
    And by the way, welcome aboard! :-)
     
    -FER
    42.0N 87.7W, or 41.4N 72.1W.
    www.HistoricalAtlas.com/lunars

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