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    Re: Artificial horizon
    From: Robert Gainer
    Date: 2005 Feb 20, 18:58 +0000

    The artificial horizon made by Freiberger is imported into the United States
    by Clausen Instrument Company. It is the type that uses a mirror with two
    spirit levels to set it. It is a very nice piece of equipment except that it
    costs over 900 dollars. For that kind of money I would get the artificial
    horizon from Cassens & Plath. It is also about 900 dollars, but it is more
    versatile as it is attached to the sextant itself in place of the scope.
    All the best,
    Robert Gainer
    >From: Alexandre Eremenko 
    >Reply-To: Navigation Mailing List 
    >Subject: Re: Artificial horizon
    >Date: Sun, 20 Feb 2005 13:24:53 -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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