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    Re: Artificial horizon
    From: Alexandre Eremenko
    Date: 2005 Feb 20, 14:20 -0500

    Just looked at their web page: $940 !
    0.5' sensitivity. It really makes sense to
    make one oneself:-)
    On Sun, 20 Feb 2005, Fred Hebard wrote:
    > 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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