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    Re: Artificial horizon
    From: Alexandre Eremenko
    Date: 2005 Feb 20, 13:24 -0500

    Dear George,
    Thank you for your interesting info
    on art horizons.
    > That's why the other (Norwegian?) type of artificial horizon,
    I've seen pictures of them in the books only.
    Are they still available?
    Theoretically, it seems to me that this model should be preferred
    for land observations.
    With my liquid art horizon I had a funny accident when I tried
    to use it first. Once I took a series of Sun altitudes
    which looked very good (very little scattering in the series)
    but when reduced showed a systematic error of about 2 degrees.
    It took me a while to figure out what was going on:-)
    My art horizon stands on an iron table with glass top.
    I confised the Sun reflection from this glass top
    with reflection from the art horizon:-)
    Then an idea came to fix a good optical quality mirror
    permanently in horizontal position,
    and use it as an artificial horizon. I am sure that there
    are bubble levels of sufficient precision to do this:
    they use such levels in transit instruments, don't they?
    So it seems that a mirror-type art horizon would be much
    more convenient for land observations.
    Are they still produced?

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