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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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