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    The Observer’s Book on Astro-Navig ation
    From: David Pike
    Date: 2016 Apr 2, 01:19 -0700

    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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