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    Re: Ball Recording Sextant Mark 1 Mod. 0
    From: Gary LaPook
    Date: 2008 Mar 19, 23:33 -0700

    Gary LaPook writes:
    
    This is the same report I previously posted as "ws.pdf."
    
    
    gl
    
    On Mar 19, 8:51 pm, Paul Hirose  wrote:
    > In 1949 the U.S. Civil Aeronautics Administration published a report on
    > a ball drop sextant constructed at the U.S. Naval Observatory. They
    > tested it in flight against a bubble sextant. The ball drop sextant
    > performed poorly.
    >
    > You can get a PDF scan (1.2 MB) of the original report online at the DOT
    > archive site:http://dotlibrary.specialcollection.net/
    >
    > Look for the section with CAA Technical Development Reports. There are a
    > lot of reports on that page; use your browser's Search feature to find
    > the word "ball". (I've never figured out how to create a link to a
    > specific page on this site, probably due to the way they use Javascript.)
    >
    > Many papers here deal with the old 4-course radio range system for air
    > navigation, as well as the early development of VOR and ILS.
    >
    > If you're interested in old time railroading, don't miss the huge trove
    > of Interstate Commerce Commission accident reports going back to 1911.
    >
    > --
    > I block messages that contain attachments or HTML.
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