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Freiberger makes one.  People also have made their own.  There are some
threads about this in the archives over the past two-three years.
Bruce Stark wrote that leveling one he built himself to high accuracy
takes a fair amount of time.

On Feb 20, 2005, at 1:24 PM, Alexandre Eremenko wrote:

> 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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