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    Re: Celestial up in the air
    From: Gary LaPook
    Date: 2008 Jul 13, 19:24 -0700
    The front has scales to compute various factors that are useful in flight such as motion of the body, motion of the observer, corriolis correction, "Q" factor and azimuth of Polaris (though the Polaris scales are out of date as they were based on the position of Polaris in the '60s.)

    The other side has a plotting board which allows for quick  and easy plotting of celnav fixes and is very useful for surface navigators as well. I recommend that everyone on the list contact Celestaire and take Ken up on his generous offer on these computers.

    It was invented by William Polhemus who was the navigator on the record setting flight in 1961 of a B-58 Hustler which flew 3626 miles from New York to Paris in 3 hours 19 minutes and 44 seconds at a speed of 1089 mph. He, and the pilot of that B-58, William Payne, also joined Ann Pelegreno on her round the world flight in 1967 in which she retraced the path of Amelia Earhart, Polhemus doing the navigation.

    See:

    http://books.google.com/books?id=VzNUJlX7CXoC&pg=PA11&lpg=PA11&dq=bill+polhemus+b-58&source=web&ots=Hus5TEvI_y&sig=4eURO61UNdxCOTRs-ZE7NI7gkNQ&hl=en&sa=X&oi=book_result&resnum=10&ct=result

    And:

    http://books.google.com/books?id=dTkgOHAYphUC&pg=PA172&lpg=PA172&dq=bill+polhemus+b-58&source=web&ots=9VsTekqvCA&sig=t8-SsaGRD0AKqJ6y03VVkx7U31E&hl=en&sa=X&oi=book_result&resnum=4&ct=result


    gl
    d walden wrote:
    Re: Celestial up in the air
     
    I have just received a Polhemus computer from Celestaire.  The instructions include a slightly manufactured example such as you requested.  They are great items.  I would heartly suggest their purchase to all bubble sextant owners.  The manual is a good primer on aerial celestial.  Thanks to Gary, I've recently aquired 4-5 flight computers of various types.  (they can be had on ebay for $5-10).  Very interesting! 





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