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    Re: Bubble sextants on eBay
    From: Gary LaPook
    Date: 2007 Jan 02, 01:23 -0800

    If you can find a MA-2 on ebay I can recommend it. I purchased one
    several years ago and it works fine in flight. It has the averager from
    the pariscopic sextant but without the tall periscope tube, much handier
    in a small cockpit. But, to keep in mind when buying on ebay, when I
    received the MA-2 the pellicle was broken  making it useless.
    Fortunately I was able to remove the pellicle from one of my spare parts
    periscopic sextants and  used it to replace the pellicle in the MA-2. It
    was like doing delicate brain surgery.
    If you get a pariscopic sextant for use on the ground you can place it
    on top of a tripod to make it steadier for taking the shot.
    I bought an A-10A from Ken about 30 years ago and got very good results
    with it in flight including transatlantic flying (before the days of
    LORAN C and GPS.) It still work good and I occasionally drag it out and
    take sights with it to stay in practice.
    Regarding electrical power for a bubble sextant, you can replace the 28
    volt bulbs with 6 volt bulbs and use 4 AA batteries in a pack to power
    the lights in the periscopic and MA-2. The A-10A uses 3 D cells to power
    the lights and also the averager.
    Gary LaPook.
    > Alexandre E Eremenko wrote:
    >> 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?
    > Periscopic sextants were designed to install in a mount in the aircraft
    > ceiling. Weight is about 6 pounds, I think. That's not bad. I find the
    > mental effort of a 2-minute observation worse than the physical effort!
    > It requires nonstop concentration and coordination to maintain the
    > correct sight picture.
    >> 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
    >> instruction.
    > respect.
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