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Alex,
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.


http://clausen.american-data.net/Merchant2/merchant.mv?Screen=PROD&Store_Code=CICI&Product_Code=ARTH&Category_Code=SE

All the best,
Robert Gainer


>From: Alexandre Eremenko 
>Reply-To: Navigation Mailing List 
>To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM
>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?
>
>Alex.

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