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    Re: Sextant used on Graf Zeppelin
    From: Bill Morris
    Date: 2011 Mar 4, 11:39 -0800

    Alan wrote
    "Despite these disadvantages, Admiral
    Richard Byrd used a tubular spirit-Ievel artificial horizon mounted on a
    conventional sextant to establish his position in his flight over the North
    Pole in 1926. Brandis & Sons of Brooklyn produced a few of these
    instruments, but they were never widely successful."

    Those interested can see some details at http://sextantbook.com/2009/08/ and http://sextantbook.com/2009/05/ . It is thought that Byrd very likely did not reach the Pole and admitted as much to Isaiah Bowman in 1930. If he used "his" sextant (it was patented by Luis de Florez), it would be no great surprise, as it had only one fore and aft level vial and nothing to indicate tilt.

    Bill Morris
    Pukenui
    New Zealand


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