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    Re: Astra IIIB
    From: John Simmonds
    Date: 2001 Apr 24, 8:35 AM

    a shallow pan of mercury is perfect 
    cheers,
    John
    
    At 21:34 23/04/2001 -0700, Yves Arrouye wrote:
    > > 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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