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    Re: Artificial horizon
    From: Alexandre Eremenko
    Date: 2005 Feb 20, 17:50 -0500

    On Sun, 20 Feb 2005, Fred Hebard wrote:
    > Alex,
    > I couldn't find the accuracy of the C+P on their website, at
    > ,
    Neither did I. That's why I asked.
    > I would expect something
    > on the order of 0.5'
    > to 1.5'.
    Then I do much better with Davis/oil for $22, not counting oil.
    Some mess and inconvenience this creates does not seem
    to we $900 worth. (I'd rather buy another sextant:-)
    > Most bubble sextants have
    > accuracies in that range, usually
    > around 1.0'.
    You mean aircraft sextants?
    > The Frieberger may be limited by the levels,
    > so that more accurate
    > levels would give a higher accuracy.
    > I'm guessing here that the mirror
    > itself is ground considerably flatter than 0.5'.
    I hope it is ground considerably flatter:-)
    The top of my balcony table ($40 in Wall mart,
    surface area 7 sq feet) is probably ground flatter.
    Again, for $900 they could use finer levels.
    I see "transit instruments/theodolites" on the web that
    have 1" precision. As these instruments are not reflecting ones,
    (not relying on the natural horizon)
    I assume their bubble levels have this precision too.

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