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Thank you Jean-Philippe. I knew about Celestaire; will check out Europe.  HewS

On 7/11/08, jean-philippe planas  wrote:
> For  overhauled and calibrated instruments you may try Celestaire in the US
> or Navastro in Europe (both are very nice and trustworthy people). These
> instruments will most likely be rather expensive but will be perfectly
> usable  dependable and reliable and will provide the required  precision:
> http://celestaire.com/catalog/products/2101.html
> http://www.navastro.fr/index.html
>
> If you are reasonably gifted with your hands and ready to spend time to work
> on the instruments (and also take some risks) you can regularly find
> specimens on Ebay as currently :
>
> 
http://cgi.ebay.fr/Aircraft-Sextant-Bubble-type-AN-5854-1-Bausch-Lomb_W0QQitemZ260260797535QQihZ016QQcategoryZ4721QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
> 
http://cgi.ebay.fr/WW-II-Aircraft-Sextant-US-Army-Air-Corps-A-10_W0QQitemZ260260803364QQihZ016QQcategoryZ4721QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
> 
http://cgi.ebay.fr/NAVY-SEXTANT-BUBBLE-TYPE-AN-5851-1-WITH-ORIGINAL-BOX_W0QQitemZ150266316156QQihZ005QQcategoryZ4721QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
> 
http://cgi.ebay.fr/AIRCRAFT-SEXTANT-MARK-V-BUBBLE-TYPE-PIONEER-INSTRUMENT_W0QQitemZ270252774568QQihZ017QQcategoryZ37971QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
> 
http://cgi.ebay.fr/WW2-BRITISH-AIRCRAFT-NAVAL-BUBBLE-SEXTANT-MK-IXA-W-CASE_W0QQitemZ150269277288QQihZ005QQcategoryZ156424QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
> 
http://cgi.ebay.fr/World-War-2-AM-Air-Ministry-Bubble-Sextant_W0QQitemZ220254580692QQihZ012QQcategoryZ4721QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
>
> JPP
>
>
> --- On Fri, 7/11/08, Hewitt Schlereth  wrote:
> From: Hewitt Schlereth 
> Subject: [NavList 5799] Re: Bubble Sextant
> To: NavList@fer3.com
> Date: Friday, July 11, 2008, 10:38 AM
>
>
> Are there any sources for these sextants? HewS
>
> On 7/11/08, engineer  wrote:
> >
> > The British Mk IX is about 200 grams lighter. and is my favourite
> > because all the controls come readily to hand, it is easy to use and
> > read and you have a reasonable chance of getting one that works. With
> > the exception of the averager on the Mk IX A, the works of the Mk IX
> > series are accesible and usually easy to fix. The bubble assembly is
> > also easy to refill.
> >
> > My A7 has a vapour pressure bubble chamber which, if
>  empty when you
> > get it is very difficult for the non-specialist to refill. Many of the
> > WW II US instruments suffered from "complification" and some
> used 4
> > prisms, heavy and expensive to produce. The AN 5854-1's
> > averager(strictly, a median device)is temperamental and hard to fix if
> > it has suffered corrosion in storage. The AN 5851(Navy Mk 5)is heavy
> > and clunky and initial setting of its averager needs care. The A10-A
> > is perhaps the handiest instrument to use, provided the electrical
> > marking system is in good order. It is not impossible for
> > a reasonably handy person to fix the system, once it has been
> > understood. The A10 uses the Mark I finger to operate the marking
> > pencil. That leaves rarer instruments, like the A8-A and the Navy Mk
> > IV. The latter was plainly not a success and if you find one, the
> > averaging system will tax the average
>  person to fix. The A12 is a
> > favourite of many people and was designed to be cheap to produce(some
> > of the others cost almost the price of a small home to produce). The
> > arc and vernier on mine are poorly cut, but if you can get one free
> > from corrosion and in working order it would be a good one to start
> > with.
> >
> > The Achilles heel of nearly all the bubble sextants is the bubble
> > chamber. For practical purposes, you cannot refill a vapour pressure
> > chamber. Happily, most of the later bubble sextant produced used a
> > different system with an air reservoir; and these are fairly easy to
> > refill. The MA series are, alas, expensive and do not often come on to
> > the market.
> >
> > Bill Morris
> >
> >
> > On Jul 11, 1:54 pm, "Gary J. LaPook"
>  wrote:
> > > My fravorite is my MA-1 which isn't a bubble sextant
>  but a
> pendulous
> > > mirror type and my second favorite is the MA-2 with a bubble. If you
> > > want a light, simple sextant get a Bendix A-7, it is the lightest
> bubble
> > > sextant I have.
> > >
> > > gl
> > >
> > >
> > >
> >
> > > glap...@pacbell.net wrote:
> > > >Here is a link to a site with discriptions of many types of
> bubble
> > > >sextants:
> > >
> > >
> >http://home.earthlink.net/%7Es543t-24dst/airnav/index.html
> > >
> > > >gl
> > >
> > > >On Jul 5, 3:19 am, glap...@pacbell.net wrote:
> > >
> > > >>You should also check the files section of the Yahoo sextant
> group for
> > > >>more information on sextants.
> > >
> > > >>http://groups.yahoo.com/group/Sextants/files/
> > >
> > > >>gl
> > >
> >
>  > >>On Jul 3, 5:14 pm, bubi352
>  wrote:
> > >
> > > >>>I am new to this group and new to celestial navigation.
> I currently
> > > >>>work as an airline pilot and fly extensively over water
> at night. I
> > > >>>have developed a keen interest in determining my
> position the old
> > > >>>fashion way.
> > >
> > > >>>Could someone tell me which bubble sextant I should buy?
> > > >>>What should I be looking on a bubble sextant?
> > > >>>Where can I buy one?
> > >
> > > >>>Thank you in advance.
> > >
> >
> > > >>>Bubi- Hide quoted text -
> > >
> > > - Show quoted text -
> > >
> >
>
>
>
>
>
>
> >
>
>
>
>

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