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alex wrote:
> Dear list members,
> I need an advise about bubble (aircraft) sextants.
>
> (I need one to measure altitudes from my balcony.
> The balcony is too shaky to use the ordinary liquid art. horizon.
> The "professional bubble attachment" from Celestaire is too
> expensive, so I am looking for an aircraft bubble sextant;
> they are typically sold on e-bay for about $100 or less.
> Seems to be a good value if it is usable).
>
> I know little about bubble sextants (what I know mostly comes
> from Ifland's book "Shooting the stars" and from the info available
> on the Internet. So I will be grateful for any advise how to choose
> one.
>
> The sellers of all air sextants on e-bay say explicitly that they do
> not
> understand how the thing works, so they are unable to tell you whether
> it works at all.
>
> One major potential problem (to my understanding) is the bubble.
> I know the guy who bought a British Mk IXA, it had no bubble at all,
> and the guy inquired on this list (few years ago) how to restore it.
> He has a web site where he explains how he filled a bubble chamber
> with hexan and so on... and had to seal and reseal it, and it
> is still leaking, etc. This seems too complicated to me.
>
> So my specific question is: is it possible to buy a WORKING aircraft
> sextant
> on e-bay, and what is the best way to do it. And what models to look
> for.
>
> Alex.


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