NavList:

Hello Jim.

The bubble is repairable. You will need to obtain a small bottle of
pure xylene and a (preferably glass) syringe with which to insert the
xylene into the  bubble chamber. You will also need to fashion a
screw driver to undo the small "Bristol" screw on the chamber. A
small Phillips screw driver is the usual starting point for this
exercise. There is a steel ball under the Bristol screw, so when you
get the screw out, don't loose that ball! A bubble exactly 5mm in
diameter in the bubble chamber is equivalent to one degree diameter
in the optical system. This is twice the diameter of the sun, so is
good for that, and is good for star sights as well.

I will scan and send you a copy of the instruction manual off list if
you like....?

Geoffrey Kolbe

At 03:34 PM 9/7/2006, you wrote:



>I just bought an A-12 via eBay.  It seems to be in working order,
>except there is no bubble - I took the bubble chamber out, and it
>looks empty.  Is this likely to be repairable?  The sextant didn't
>come with a manual, and I don't see any offered on eBay at the moment.
>Would someone be willing to scan theirs?  (I assume it would be a US
>government document, so not subject to copyright - but if I'm out of
>line, just let me know.)
>
>             - Jim Van Zandt
>
>
>

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