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    Re: Bubble horizon
    From: Paul Hirose
    Date: 2002 Dec 18, 13:18 -0800

    "Dr. Geoffrey Kolbe" wrote:
    > To answer George Huxtable's question on the sort of accuracy one should
    > expect from a bubble sextant. I have a Link A-12 aircraft sextant (still
    > available from Celestaire, last time I looked,) and I would expect an
    > altitude measurement to be within +/- one minute. I am disappointed if I am
    > two minutes out and I cannot remember the last time I was more than two
    > minutes out.
    That is impressive. I have never done a serious accuracy test with
    mine, but I doubt I could match your performance. What are you
    shooting? Sun? Stars?
    Are you able to get batteries to fit the night illuminator? The ones
    I've tried are a shade too fat to go into the nose cap that holds the
    bulb. It seems C cell diameter has increased slightly since the 1940s,
    when the sextant was made.

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