NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Modern sextant production. Reply from SNO-T factory.
From: Jean-Philippe Planas
Date: 2012 Apr 14, 06:23 -0700
From: Alexandre E Eremenko <eremenko@math.purdue.edu>
To: NavList@fer3.com
Sent: Saturday, April 14, 2012 12:46 AM
Subject: [NavList] Re: Aw: Re: Modern sextant production. Reply from SNO-T factory.
Jean Philippe,
I am glad they are still in business, and I am surprised
with 54" arc error, perhaps there is another reason for this
error which Wolfgang overlooked?
If I bought a new sextant with such arc error, I would
inquire at the factory.
It is not true that they just write "Gut" in the certificates, or
ar least this was not the case in 2005.
(It is Cassens-Plath who write this).
I have a beautiful
genuine Freiberger certificate for my SNO-T, written on the
printed Freiberger's table with their logo, and showing
actual corrections in seconds for every 10 degrees,
from 0 to 120, which were
measured in my presence.
The errors it shows are so small, the largest is 10",
that I never use these numbers.
But 54" cannot be caled "Gut", even for everyday navigation
if we aim at 1' overall accuracy.
However, their advertizing booklet that I have does not specify what
"Gut" means exactly :-)
Alex.
On Fri, 13 Apr 2012, Jean-Philippe Planas wrote:
>
> Guten Abend Wolgang,
>
> Vielen Dank for the info.
> "My specimen festures quite large instrument errors (likely most of it eccentricity) of up to +54""
>
> I am very surprised by the amount of excentricity error. I believed such instruments were not allowed to get out of the factory if the error was more than +/-30" for the regular "trommel sextant model" and even +/- 20" for the "SIRIUS" model.
> Did you have your instrument checked on an optical bench as theFreiberger certificate usually says nothing more than "GUT" or "free of errors for practical use".
>
> Gruss
>
> JPP
>
>
>
> ________________________________
> From: "wolfgang.hasper---de" <wolfgang.hasper---de>
> To: NavList@fer3.com
> Sent: Friday, April 13, 2012 6:22 PM
> Subject: [NavList] Aw: Re: Modern sextant production. Reply from SNO-T factory.
>
>
> Jean,
>
>
> Freiberger is still active making new sextants.
>
> I have one made in 2009 (Serial No not at hand)
>
>
> their website is somewhat hard to find,
>
> here it is
>
>
> http://www.fpm.de/lang_en/index.php?c=1&s=nautic
>
>
> My specimen festures quite large instrument errors (likely most of it eccentricity) of up to +54" which I think is a bit much given the price of around 1000?.
>
>
> Best
>
> Wolfgang
>
>
>
>
>
> Gesendet: Freitag, 13. April 2012 um 15:32 Uhr
> Von: "jean-philippe planas" <jeanphilippeplanas---com>
> An: "NavList@fer3.com" <NavList@fer3.com>
> Betreff: [NavList] Re: Modern sextant production. Reply from SNO-T factory.
> You can still get new freibergers from authorised dealers, at least in Europe.
> http://navastro.fr/
> http://digipoche.free.fr/
> http://www.regiozeist.nl/freiberger/index.php?item=freiberger-sextants-new&action=page&group_id=17&lang=EN
>
> JPP
>
>
>
> ________________________________
> From: Alexandre E Eremenko <eremenko---purdue.edu>
> To: NavList@fer3.com
> Sent: Friday, April 13, 2012 2:49 PM
> Subject: [NavList] Re: Modern sextant production. Reply from SNO-T factory.
>
>
> I wonder whether Freiberger factory still makes their sextants.
> (I found no proof of this, searching on Internet).
>
> Alex.
>
> P.S. But Freibergers and SNO-T's in good condition can be still
> found on e-bay, quite frequently.
>
>
> On Fri, 13 Apr 2012, Jean-Philippe Planas wrote:
>
>>
>> Thak you Alex.
>>
>> Too bad, it is(was) such an outstanding instrument.
>>
>> I wrote them a letter of inquiry (physical mail) in english to their adress in St-Peterburg 4 or 5 years ago and never had the chance to get any answer, whether in Russian or in any other form.
>>
>> JPP
>>
>>
>>
>> ________________________________
>> From: Alexandre E Eremenko <eremenko---purdue.edu>
>> To: NavList@fer3.com
>> Sent: Friday, April 13, 2012 2:16
> PM
>> Subject: [NavList] Modern sextant production. Reply from SNO-T factory.
>>
>>
>> Few weeks ago,
>>
>> I wrote an e-mail (in English) to the director of the SNO-T
>> factory in StPeterburg, asking about SNO, and refering
>> to their advertisement on the Internet.
>>
>> Today I received an official reply (in Russian) which says:
>>
>> "This is to let you know that our enterprize no longer makes
>> the SNO-T product."
>>
>> (My translation). Signed by the Head of the Planning Department
>> T. G. Trebkova.
>>
>>
>> Alex.
>>
>>
>>
>> : http://fer3.com/arc/m2.aspx?i=119032
>>
>>
>>
>
>
>
>
>
>
>
>
> Ihr WEB.DE Postfach immer dabei: die kostenlose WEB.DE Mail App f?r iPhone und Android.
> https://produkte.web.de/freemail_mobile_startseite/
>
>
>
> : http://fer3.com/arc/m2.aspx?i=119041
>
>
>
From: Jean-Philippe Planas
Date: 2012 Apr 14, 06:23 -0700
Alex,
My mistake. Freiberger did provide certificates including excentricity error figures every 10° along the arc.
For unknown reasons they also issued certificates without figures just saying; "Gebrauch als felherfrei zu bezeichnen."
The "GUT" qualification was only used as a qualitative assessment of the filters and scope conditions.
As
for excentricity specifications, I was told that the ordinary "Drum"
model excentricity should not exceed 30" and the more expensive "SIRIUS"
model was supposed to feature an excentricity error of less than 20".
But this doesn't seem to be completely true as I found a Freiberger
certificate indicating errors of up to 45" at 110° and 120° marks.
JPP
JPP
From: Alexandre E Eremenko <eremenko@math.purdue.edu>
To: NavList@fer3.com
Sent: Saturday, April 14, 2012 12:46 AM
Subject: [NavList] Re: Aw: Re: Modern sextant production. Reply from SNO-T factory.
Jean Philippe,
I am glad they are still in business, and I am surprised
with 54" arc error, perhaps there is another reason for this
error which Wolfgang overlooked?
If I bought a new sextant with such arc error, I would
inquire at the factory.
It is not true that they just write "Gut" in the certificates, or
ar least this was not the case in 2005.
(It is Cassens-Plath who write this).
I have a beautiful
genuine Freiberger certificate for my SNO-T, written on the
printed Freiberger's table with their logo, and showing
actual corrections in seconds for every 10 degrees,
from 0 to 120, which were
measured in my presence.
The errors it shows are so small, the largest is 10",
that I never use these numbers.
But 54" cannot be caled "Gut", even for everyday navigation
if we aim at 1' overall accuracy.
However, their advertizing booklet that I have does not specify what
"Gut" means exactly :-)
Alex.
On Fri, 13 Apr 2012, Jean-Philippe Planas wrote:
>
> Guten Abend Wolgang,
>
> Vielen Dank for the info.
> "My specimen festures quite large instrument errors (likely most of it eccentricity) of up to +54""
>
> I am very surprised by the amount of excentricity error. I believed such instruments were not allowed to get out of the factory if the error was more than +/-30" for the regular "trommel sextant model" and even +/- 20" for the "SIRIUS" model.
> Did you have your instrument checked on an optical bench as theFreiberger certificate usually says nothing more than "GUT" or "free of errors for practical use".
>
> Gruss
>
> JPP
>
>
>
> ________________________________
> From: "wolfgang.hasper---de" <wolfgang.hasper---de>
> To: NavList@fer3.com
> Sent: Friday, April 13, 2012 6:22 PM
> Subject: [NavList] Aw: Re: Modern sextant production. Reply from SNO-T factory.
>
>
> Jean,
>
>
> Freiberger is still active making new sextants.
>
> I have one made in 2009 (Serial No not at hand)
>
>
> their website is somewhat hard to find,
>
> here it is
>
>
> http://www.fpm.de/lang_en/index.php?c=1&s=nautic
>
>
> My specimen festures quite large instrument errors (likely most of it eccentricity) of up to +54" which I think is a bit much given the price of around 1000?.
>
>
> Best
>
> Wolfgang
>
>
>
>
>
> Gesendet: Freitag, 13. April 2012 um 15:32 Uhr
> Von: "jean-philippe planas" <jeanphilippeplanas---com>
> An: "NavList@fer3.com" <NavList@fer3.com>
> Betreff: [NavList] Re: Modern sextant production. Reply from SNO-T factory.
> You can still get new freibergers from authorised dealers, at least in Europe.
> http://navastro.fr/
> http://digipoche.free.fr/
> http://www.regiozeist.nl/freiberger/index.php?item=freiberger-sextants-new&action=page&group_id=17&lang=EN
>
> JPP
>
>
>
> ________________________________
> From: Alexandre E Eremenko <eremenko---purdue.edu>
> To: NavList@fer3.com
> Sent: Friday, April 13, 2012 2:49 PM
> Subject: [NavList] Re: Modern sextant production. Reply from SNO-T factory.
>
>
> I wonder whether Freiberger factory still makes their sextants.
> (I found no proof of this, searching on Internet).
>
> Alex.
>
> P.S. But Freibergers and SNO-T's in good condition can be still
> found on e-bay, quite frequently.
>
>
> On Fri, 13 Apr 2012, Jean-Philippe Planas wrote:
>
>>
>> Thak you Alex.
>>
>> Too bad, it is(was) such an outstanding instrument.
>>
>> I wrote them a letter of inquiry (physical mail) in english to their adress in St-Peterburg 4 or 5 years ago and never had the chance to get any answer, whether in Russian or in any other form.
>>
>> JPP
>>
>>
>>
>> ________________________________
>> From: Alexandre E Eremenko <eremenko---purdue.edu>
>> To: NavList@fer3.com
>> Sent: Friday, April 13, 2012 2:16
> PM
>> Subject: [NavList] Modern sextant production. Reply from SNO-T factory.
>>
>>
>> Few weeks ago,
>>
>> I wrote an e-mail (in English) to the director of the SNO-T
>> factory in StPeterburg, asking about SNO, and refering
>> to their advertisement on the Internet.
>>
>> Today I received an official reply (in Russian) which says:
>>
>> "This is to let you know that our enterprize no longer makes
>> the SNO-T product."
>>
>> (My translation). Signed by the Head of the Planning Department
>> T. G. Trebkova.
>>
>>
>> Alex.
>>
>>
>>
>> : http://fer3.com/arc/m2.aspx?i=119032
>>
>>
>>
>
>
>
>
>
>
>
>
> Ihr WEB.DE Postfach immer dabei: die kostenlose WEB.DE Mail App f?r iPhone und Android.
> https://produkte.web.de/freemail_mobile_startseite/
>
>
>
> : http://fer3.com/arc/m2.aspx?i=119041
>
>
>
