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    Re: Raw data for bubble
    From: Alexandre Eremenko
    Date: 2007 Mar 8, 20:47 -0500

    
    Bill,
    
    > > Without averager, error -1.6.a
    >
    > I don't see figures to support -1.6a.  What is -1.6a? What was the sigma?
    
    error -1.6 means that I made only one observation,
    and the error of this observation was -1.6
    The "a" after "-1.6." is a misprint.
    
    > > Without averager: errors -3.5, -2.7, -3.4, -4.1, 0.0, -2.8.
    >
    > Which would be average -2.75, sigma 1.4. Yes?
    
    Yes.
    
    > Have you attempted do place
    > Venus or a star on the top edge then bottom edge
    > of the bubble and manually average?
    
    No I did not. And for a good reason,
    which also answers the question recently asked by
    Jean-Philippe:
    My sextant bubble has a tendency to grow with time.
    (Sometimes it does sometimes it does not, probably
    this depends on the temperature and pressure conditions).
    I tried to release the bubble screw completely;
    this does not help.
    In general this is a minor nuisance but it prevents
    the type of observation Bill asks.
    
    Alex.
    
    
    
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