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    Re: Astra IIIB
    From: Sam Chan
    Date: 2001 Apr 23, 10:41 PM

    I tried a small plate of water in my backyard and it worked fine if it
    wasn't for the wind. The Davis Artificial Horizon has a cover that will
    protect the water surface from the wind. It should work better.
    
    Sam
    ----- Original Message -----
    From  "Yves Arrouye" 
    To: 
    Sent: Monday, April 23, 2001 9:34 PM
    Subject: Re: Astra IIIB
    
    
    > > The practice bubble horizon is difficult to use. There is no
    > > magnification.
    > > The slit aperture makes me see double of the reference line
    > > in the sight.
    > > Combine that with trying to hold the sextant steady so the bubble is
    > > centered while adjusting the sight ... it can be frustrating.
    >
    > I know, I tried it. What's very frustrating is how any small movement
    makes
    > the bubble go away. But then, I didn't seem to have much success with a
    pan
    > of water in my garden either. Maybe oil would be better? Anyway, the
    bubble
    > horizon is on order, and I'll see what my first sights will be. Not good I
    > imagine...
    >
    > YA
    >
    

       
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