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    RAF MK9 Bubble Sextant
    From: Steven Grobler
    Date: 2003 Jan 18, 17:57 +0800

    Good day all,
    I've recently acquired an old MK9B RAF sextant and I am hoping that
    someone could shed some light on a few issues (I've read some of the
    previous posts and I have a copy of the MK9A manual, courtesy of Clive
    Sutherland's earlier posting).
    I am not intending to use the sextant seriously, its more of a hobby
    item at this stage.
    1. I am unable to produce a bubble because the bubble chamber is only
    partially full of fluid.
    Could anyone explain the principle of operation of the bubble device
    What fluid is used?
    Could I refill it?
    If so what would be the procedure?
    2. my sextant (the B variation) has an additional control on the
    clockwork averaging mechanisim, near the winder - a small two position
    selector marked I and II. I guess this might change the averaging time,
    or number of averages...
    Could anyone confirm?
    Steve G

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