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    Re: Bubble Sextant
    From: Gary LaPook
    Date: 2008 Jul 11, 13:05 -0700
    attached is more information about various bubble sextants.
    gl


    Hewitt Schlereth wrote:
    Thank you Jean-Philippe. I knew about Celestaire; will check out Europe.  HewS
    
    On 7/11/08, jean-philippe planas <jeanphilippeplanas@yahoo.com> 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 <hhew36@gmail.com> wrote:
    From: Hewitt Schlereth <hhew36@gmail.com>
    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 <engineer@clear.net.nz> 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"
          
    <glap...@pacbell.net> 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
    <benjaminriec...@hotmail.com> 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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    File: 105805.sextant-pages-from-nif45-3.pdf
       
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