![Welcome to the NavList Message Boards.](../sx1.jpg)
NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Artificial horizon
From: Alexandre Eremenko
Date: 2005 Feb 20, 14:20 -0500
From: Alexandre Eremenko
Date: 2005 Feb 20, 14:20 -0500
Fred, thanks. Just looked at their web page: $940 ! 0.5' sensitivity. It really makes sense to make one oneself:-) Alex. 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. > > >