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    Bubble sextants on e-bay
    From: Alexandre Eremenko
    Date: 2006 Dec 31, 12:02 -0800

    Dear list members,
    I need an advise about bubble (aircraft) sextants.
    (I need one to measure altitudes from my balcony.
    The balcony is too shaky to use the ordinary liquid art. horizon.
    The "professional bubble attachment" from Celestaire is too
    expensive, so I am looking for an aircraft bubble sextant;
    they are typically sold on e-bay for about $100 or less.
    Seems to be a good value if it is usable).
    I know little about bubble sextants (what I know mostly comes
    from Ifland's book "Shooting the stars" and from the info available
    on the Internet. So I will be grateful for any advise how to choose
    The sellers of all air sextants on e-bay say explicitly that they do
    understand how the thing works, so they are unable to tell you whether
    it works at all.
    One major potential problem (to my understanding) is the bubble.
    I know the guy who bought a British Mk IXA, it had no bubble at all,
    and the guy inquired on this list (few years ago) how to restore it.
    He has a web site where he explains how he filled a bubble chamber
    with hexan and so on... and had to seal and reseal it, and it
    is still leaking, etc. This seems too complicated to me.
    So my specific question is: is it possible to buy a WORKING aircraft
    on e-bay, and what is the best way to do it. And what models to look
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