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    Re: The Observer’s Book on Astro-Nav igation
    From: Brad Morris
    Date: 2016 Apr 30, 11:18 -0400

    And at 1:06:44, we have the Navigator (?) of the Graf Zeppelin taking another reading, this time purportedly over the Pacific

    Brad

    On Apr 30, 2016 11:00 AM, "Brad Morris" <NoReply_Morris@fer3.com> wrote:

    Hello David

    I came across an image of sextant use on the Graf Zeppelin in 1929!

    It's on YouTube.  The title is " Graf Zeppelin 1929 Around Globe Trip, Full Documentary".  The link is https://youtu.be/d4jq7oRxw-g

    At 48 minutes and 38 seconds, we see the navigator (?) holding his sextant, whilst taking an observation, purportedly over Siberia.

    The image is attached.  I note the large box-like structure by where the horizon mirror should be.  Is that an artificial horizon?!?

    Brad

    On Apr 2, 2016 4:25 AM, "David Pike" <NoReply_DavidPike@fer3.com> wrote:

    Francis Upchurch wrote:  In Chichester's  4 wartime cel nav teaching books, there is no mention of a box sextant, but book 4 has a page on an "Airship sextant" , which looks just like a good marine sextant with micrometer.

    Francis.  It’s interesting that that you’ve got Part 4 of the Observer’s Books.  I’ve only got Parts 1, 2, and 3 (Issued to or bought by Plt Off Whapham at 2s 6p each).  Mine only advertise three parts on the covers.  Could you possibly photograph the pages in part 4 on airship navigation?  Two interesting points I notice.  I always thought Observer’s books were ‘of’ e.g. ‘The Observer's Book of Trees’, but these are books ‘on’.  This is grammatically quite correct of course and a sign of more formal times.  Also, it seems I’m not the only user of ‘Astro’ instead of ‘Celestial’; the great man did so too.  DaveP

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