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    Re: Bubble horizon
    From: Geoffrey Kolbe
    Date: 2002 Dec 17, 08:52 +0000

    Robert Eno wrote:
    >To make a long story short, unless you can adjust the size of the bubble,
    >you will experience errors; sometimes gross errors.
    I, and I am sure some others on the list, would be grateful to Robert if he
    could make this short story a little longer. Why is the size of the bubble
    critical? Is Robert concerned that the damping of the bubble movement is a
    function of bubble size, or that the accuracy with which the celestial
    object can be centered in the bubble is a function of bubble size, or some
    other consideration?
    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.
    Geoffrey Kolbe.

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