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    Re: Kollsman averagers
    From: Douglas Denny
    Date: 2009 Nov 25, 02:12 -0800

    May I offer a possible explanation?  It is only a guess however.
    The pendulous reference is easier to use than a bubble, being an horizon 
    indicator rather than a circle in which the star is placed.  This I believe 
    gives simpler and greater accuracy of observation than a bubble where the 
    observer has to estimate the centre placement of the star in the bubble, and 
    hence would require less time to complete an assessment of the star alignment 
    with the reference.
    The oscillation period of a large aircraft I would have expected to be within 
    a minute anyway,  so anything above one minute is not necessarily going to 
    increase accuracy on this count. The only increase in accuracy would be if 
    there are longer term accelerations present (such as an unwanted inadvertent 
    side-slip) corrected within the time period of observation.
    The only answer must be ultimately that tests would have been carried out by 
    Kollsman and they probably found little difference in results for the one 
    minute as opposed to two minute observation periods.
    Douglas Denny.
    Chichester.  England.
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