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    Re: Infrared sextant
    From: Dave Walden
    Date: 2014 Aug 24, 11:34 -0700

    I also saw this the other day.  Here's the patent:

    https://docs.google.com/viewer?url=patentimages.storage.googleapis.com/pdfs/US1944897.pdf

    and an image:

    http://www.gettyimages.com/detail/news-photo/paul-humphrey-macneil-inventor-of-the-macneil-all-weather-news-photo/3336630

     

       
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