Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: Bubble Sextant
    From: Hewitt Schlereth
    Date: 2008 Jul 11, 14:50 -0400

    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 -
    > > >
    > >
    >
    >
    >
    >
    >
    >
    > >
    >
    >
    >
    >
    
    --~--~---------~--~----~------------~-------~--~----~
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To unsubscribe, email NavList-unsubscribe@fer3.com
    -~----------~----~----~----~------~----~------~--~---
    
    

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
    Email:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site