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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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