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    Re: RAF MK9 Bubble Sextant
    From: Steven Grobler
    Date: 2003 Jan 19, 17:32 +0800

    Hi Robert,
    Many thanks for your reply.
    Yes, my model has the dual eyepiece - one seems to give more
    magnification than the other. Most of my controls work smoothly, except
    for the 5 degree increase switch, which is probably a bit sticky. If I
    figure out how to free things up I'll let you know.
    I would be most grateful of the instructions for refilling the bubble
    fluid. It looks like the fluid is contained in a small vertical
    cylinder rising above the bubble chamber. The end of the cylinder has a
    small nozzle that is sealed with solder. I am not sure whether the
    system is supposed to be pressurized, or under vacuum, so I haven't
    tried opening anything yet - I'll wait with baited breath for your set
    of instructions!!
    Thanks again
    Steve G
    ----- Original Message -----
    From: Robert Eno 
    Date: Sunday, January 19, 2003 1:18 am
    Subject: Re: RAF MK9 Bubble Sextant
    > Happy to oblige,
    > Your problem with the bubble chamber is that the fluid -- hexane --
    > has
    > likely leaked out somewhere. I have a set of hand-drawn
    > instructions on how
    > to re-fill the chamber, given to me many years ago by probably the
    > last fellow on earth that actually knows how to fix these things.
    > I will dig them up and try to send them to you as a PDF over the
    > next few
    > days.
    > You are correct about the function of the little control knob on the
    > averager: it allows you to select either a one or two minute
    > averaging time.
    > Sounds like you have a Mk IX BM model which should have a dual
    > eyepiece. Is
    > this so?  I have one of these in my collection. Unfortunately, the
    > fineadjust knob is very stiff and I have not been able to figure
    > out how to
    > loosen it.
    > cheers,
    > Robert Eno

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