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    Re: Astra IIIB
    From: Doug Sterrett
    Date: 2001 Apr 24, 10:35 AM

    John, please caution people that mercury is highly poisonous and very
    dangerous for laymen to handle.  In many states it is a controlled
    substance.  It is also extremely expensive.
    Humbly submitted by
    At 12:34 AM 4/25/01 +1000, you wrote:
    >a shallow pan of mercury is perfect 
    >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

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