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    Re: Bubble sextants on eBay
    From: Alexandre Eremenko
    Date: 2006 Dec 31, 21:02 -0500

    Dear Paul,
    Thank you very much for the valuable information
    you gave me.
    I was not considering a periscopic sextant yet, because
    I thought they are too heavy (aren't they supposed to
    be hanging on some hook in the airplane during an
    observation?) What is the weight of your periscopic sextant?
    > The only way to be sure about the bubble is to walk
    > the seller through
    > the process of forming the bubble.
    > Ask if the averager works too.
    That's a big problem of course. As I never held one in my
    hands, I doubt that I can give to a seller good
    I also noticed that many sellers do not want to answer
    even the simplest questions (like what is the arc radius
    of an ordinary sextant). And to extort good photos
    from a typical seller is a big problem too.
    Many sellers just don't want to be bothered.
    > Be careful about batteries -- my A-12 sextant
    > because modern C cells don't fit
    Somehow I always thought that one can attach a battery
    somehow, even if it does not fit:-)
    > radioactive paint (to illuminate the bubble at night)
    So AN 5951 does not require any battery for observation,
    Is the bubble usually illuminated by the day light when
    available? Or there are models where you have to use
    electricity even in daylight?
    > The AN5851s have electric illumination for reading the
    > altitude scales,
    Reading the scales should not be a problem with a little
    flashlight. I always use it with marine sextants and find
    it more convenient (and much brighter) than the built-in
    Thanks a lot for your info and
    Happy NY !
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