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My sincere thanks for all the good information. My memories ov
standing on a bench, head in the astrodome, and seeing a thousand
times more stars than from the ground. You guys are great.


Arthur Hill, Philadelphia

On Dec 13, 3:22�pm, jean-philippe planas
 wrote:
> Hello Thomas,
>
> Yes it's a good idea and anyway it goes in the correct direction to keep/form a suitable bubble.
> Has anyone on the List experimented this technique?
>
> JPP
>
> Thomas Kleemann  wrote:
>
> Hello,
>
> I've got no experience with aircraft sextants at all, but if you wish
> to achive overpressure in a liquid filled container then put it into a
> freezer prior to sealing.
>
> When it get back to ambient (room) temperature the pressure rises and
> therefore the bubble shrinks.
>
> The exterior temperatures in flight are a little bit harsher than what
> your freezer can provide, so your sextant is not endangered (xylene's
> melting point is around -50 centigree, hexane's is even lower).
>
> /Thomas
>
> jean-philippe planas schrieb:
>
>
>
> > It is also my experience that all bubble assemblies gradually loose part
> > or all of their xylene over time without any obvious leak or xylene
> > characteristic smell.
> > I have reconditionned 4 A10 or A10As and 5 bubble units and they all
> > lost part of their xylene in a matter of months.
> > Without refilling the assemblies in a low pressure container I don't
> > think we can do any better.
> > If anybody has a better experience on A10s, please speak up!
> > JPP
>
> ---------------------------------
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