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    Re: Sextant Comparisons -> to Joel Jacobs...
    From: Joel Jacobs
    Date: 2004 Mar 21, 01:03 -0500

    Courtney,
    
    IMO, the SNO-T is of higher quality than a SNO-M and maybe even better than
    a Freiberger. I would prefer it to either of the other two.
    
    Joel
    
    
    ----- Original Message -----
    From: "Courtney Thomas" 
    To: 
    Sent: Saturday, March 20, 2004 8:16 PM
    Subject: Re: Sextant Comparisons -> to Joel Jacobs...
    
    
    > Thank you Joel.
    >
    > Are the T and M sextants equivalent in quality ?
    >
    > Courtney
    >
    >
    >
    > Joel Jacobs wrote:
    >
    > > Hi Courtney,
    > >
    > > I think it has been explained here before that under the Cyrillic
    alphabet,
    > > the English C is the same as the Russian S so that SNO-T and SNO-T are
    the
    > > same sextant. Your SNO-T sextant has many similarities to the German
    > > Freiberger, including its paint, but is appreciably smaller in size. It
    is a
    > > more expensive sextant than the SNO-M. I have seen the SNO-M in both
    black,
    > > and military green.
    > >
    > > Joel
    > >
    > >
    > > ----- Original Message -----
    > > From: "Courtney Thomas" 
    > > To: 
    > > Sent: Saturday, March 20, 2004 5:39 PM
    > > Subject: Re: Sextant Comparisons -> to Joel Jacobs...
    > >
    > >
    > >
    > >>Joel,
    > >>
    > >>I should have said...I have a SNO-M, not T. Anyway, the awful olive
    > >>color and the one scope. I got it real cheap and want to bring it up to
    > >>snuff.
    > >>
    > >>I also have a more recent SNO-T which has an agreable silver color and 2
    > >>scopes.
    > >>
    > >>But I obviously agree that the Russian sextants are good and a great
    buy.
    > >>
    > >>Appreciatively,
    > >>Courtney
    > >>
    > >>
    > >>
    > >>Courtney Thomas wrote:
    > >>
    > >>
    > >>>Joel,
    > >>>
    > >>>I have one and hate the color, but am otherwise satisfied.
    > >>>
    > >>>What is "black wrinkle paint" ? Where do I get it and how is it applied
    > >>>for optimal esthetics ?
    > >>>
    > >>>Where can I get a proper scope for CELNAV ? How much ?
    > >>>
    > >>>Appreciatively,
    > >>>
    > >>>Courtney
    > >>>
    > >>>
    > >>>
    > >>>Joel Jacobs wrote:
    > >>>
    > >>>
    > >>>>Fred,
    > >>>>
    > >>>>Your best bet is a Russian SNO-T sextant. They are very underrated,
    > >>>>and have
    > >>>>most all the features of the preferred brands, and even come in a
    > >>>>
    > > smaller
    > >
    > >>>>size for convenience. However, most of them are sold with only an
    > >>>>astronomical scope which presents the image inverted, and IMO are
    > >>>>
    > > useless
    > >
    > >>>>for CELNAV. Configured with the 7 x scope, you should be able to buy
    > >>>>one for
    > >>>>$250.00 because they are a drudge on the market with out an erect
    > >>>>
    > > imaging
    > >
    > >>>>scope. You can read about them in detail at:
    > >>>>
    > >>>>
    > >>>>
    > >
    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3712084763&category=37971
    > >
    > >>>>&sspagename=STRK%3AMESSE%3AIT&rd=1
    > >>>>
    > >>>>They wont meet your standards for good looks, but you can get some
    > >>>>
    > > black
    > >
    > >>>>wrinkle paint, and make them look as pretty as you like. They are a
    > >>>>
    > > great
    > >
    > >>>>buy.
    > >>>>
    > >>>>Joel Jacobs
    > >>>>
    > >>>>
    > >>>>
    > >>>>----- Original Message -----
    > >>>>From: "Fred Hebard" 
    > >>>>To: 
    > >>>>Sent: Saturday, March 20, 2004 12:15 PM
    > >>>>Subject: Re: Sextant Comparisons
    > >>>>
    > >>>>
    > >>>>
    > >>>>
    > >>>>>Doug,
    > >>>>>
    > >>>>>No, I don't collect older equipment.  I have been trying to acquire a
    > >>>>>sextant suitable for lunar observations, so I look for sextants with
    > >>>>>defects on Ebay that might still be serviceable.
    > >>>>>
    > >>>>>I have one British Husun that only has the "star scope."  It's a 2.5x
    > >>>>>power scope.  It's my understanding that a more powerful one would
    > >>>>>
    > > give
    > >
    > >>>>>more precise readings.  I checked this by buying an old Simex-type
    > >>>>>sextant, which subsequently was sold.  I have been looking for
    another
    > >>>>>Husun with the inverting telescope or another instrument.  The
    Cassens
    > >>>>>& Plath was the first that came up which was suitable.
    > >>>>>
    > >>>>>In comparing the Cassens and Plath to the Husun, I would say,
    overall,
    > >>>>>that I prefer the Husun at this time.  It's prettier, with the
    > >>>>>silver-inlayed arc; this increases my fondness for the instrument.
    > >>>>>
    > > The
    > >
    > >>>>>black crinkle finish is nicer than the Cassens and Plath's.  All the
    > >>>>>screws are varnished or painted brass; there's no aluminum to corrode
    > >>>>>with steel screws or react with the brass or bronze (There's no
    > >>>>>corrosion on my Cassens and Plath; it doesn't appear ever to have
    been
    > >>>>>used for extended periods).
    > >>>>>
    > >>>>>The 2.5x scope on the Husun has a very wide field of view, wider than
    > >>>>>the 4x "star scope" on the Cassens and Plath.  I have seen no optical
    > >>>>>aberrations in the Husun, while the Cassens and Plath star scope has
    > >>>>>chromatic aberration, which rather surprised me (reddish fringe on
    the
    > >>>>>bottom of the image and bluish fringe on the top).  The aberration
    > >>>>>makes it more difficult to check index error by measuring the sun's
    > >>>>>semidiameter.
    > >>>>>
    > >>>>>The handle on the Husun is straight up and down.  This makes some
    > >>>>>lunars easier, whereas the tilted handle on both brands of Plaths,
    > >>>>>while it makes looking at the horizon easier on the wrist, makes
    > >>>>>
    > > lunars
    > >
    > >>>>>more difficult.  When holding the instrument between shots or while
    > >>>>>waiting, the Husun is less fatiguing to hold
    > >>>>>
    > >>>>>The star scope on the Husun is in close to the horizon mirror.  This
    > >>>>>centers weight in the instrument, making it less fatiguing to hold.
    > >>>>>Being close in to the horizon mirror, the smaller mirror does not
    > >>>>>restrict the field of view of the instrument as much as one might
    > >>>>>suppose.  I suppose the larger mirrors would be "faster" optically,
    > >>>>>however.
    > >>>>>
    > >>>>>The perceived weight of the two instruments is similar.  I have not
    > >>>>>actually weighed them.
    > >>>>>
    > >>>>>The lamp on the Husun can be swung around to illuminate my wrist band
    > >>>>>when recording data.  The lamp on the Cassens and Plath is guided to
    > >>>>>illuminate the scales only, making recording data more difficult.
    > >>>>>
    > >>>>>The box on the Husun is significantly smaller than the box on the
    > >>>>>
    > > other
    > >
    > >>>>>instruments.
    > >>>>>
    > >>>>>These are my impressions after two days.
    > >>>>>
    > >>>>>Fred
    > >>>>>
    >
    >>>>------------------------------------------------------------------------
    > >>>>
    > >>>>>Frederick V. Hebard, PhD                      Email:
    > >>>>>
    > > mailto:Fred@acf.org
    > >
    > >>>>>Staff Pathologist, Meadowview Research Farms  Web: http://www.acf.org
    > >>>>>American Chestnut Foundation                  Phone: (276) 944-4631
    > >>>>>14005 Glenbrook Ave.                          Fax: (276) 944-0934
    > >>>>>Meadowview, VA 24361
    > >>>>>
    > >>>>>On Mar 19, 2004, at 5:44 PM, Royer, Doug wrote:
    > >>>>>
    > >>>>>
    > >>>>>
    > >>>>>>By the way,do you collect older sextants?Don't you also have some
    > >>>>>>
    > > older
    > >
    > >>>>>>British equipment you wrote about in the past?Just curious.
    > >>>>>>
    > >>>>>>
    > >>>
    > >>>--
    > >>>Courtney Thomas
    > >>>s/v Mutiny
    > >>>lying Oriental, NC
    > >>>WDB5619
    > >>>
    > >>>
    > >>
    > >>--
    > >>Courtney Thomas
    > >>s/v Mutiny
    > >>lying Oriental, NC
    > >>WDB5619
    > >>
    > >
    >
    >
    > --
    > Courtney Thomas
    > s/v Mutiny
    > lying Oriental, NC
    > WDB5619
    
    
    

       
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