NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Instrument for solving spheric al triangles
From: Zvi Doron
Date: 2012 Apr 26, 15:00 +0100
From: Zvi Doron
Date: 2012 Apr 26, 15:00 +0100
You mean one minute
Sent from my HTC
----- Reply message -----
From: "Geoffrey Kolbe" <geoffreykolbe@compuserve.com>
To: <zvidoron@btinternet.com>
Subject: [NavList] Re: Instrument for solving spherical triangles
Date: Thu, Apr 26, 2012 13:37
List member Wolfgang Koeberer gave a very interesting talk on such
instruments to the recent National Maritime Museum conference in
Greenwich (England). The earliest example he showed dated from the
16th century, I believe. They were re-invented regularly over the
succeeding centuries and all had the feature of four intersecting
circles of adjustment, from which the spherical triangle could be
solved. The astro-compass was probably the latest (and last)
instrument to be commercially made in that tradition and Wolfgang
said that with care, an accuracy of one degree was possible using the
astro-compass.
Geoffrey
At 13:19 26/04/2012, you wrote:
>For this one we have a patent with good pictures in our list archive:
>http://fer3.com/arc/img/106506.fix_finder.pdf
>Unlike the bubble octant, these things are very rare on e-bay,
>from which I conclude that not so many were produced.
>
>Alex.
>
>P.S. My son who had a pilot training in 1994, and who works in
>the airspace industry says that he has never seen a sextant
>(and it was never mentioned during his training) until I showed him one.
>
>On Thu, 26 Apr 2012, G Becker wrote:
>
>>
>>Here is a link to a newspaper blurb on the Zerbee Celestial Fix
>>Finder... the caption says it was revolutionary in jet navigation. :/
>>
>>http://news.google.com/newspapers?nid=2206&dat=19511028&id=FJMzAAAAIBAJ&sjid=YOkFAAAAIBAJ&pg=3196,6472009
>>----------------------------------------------------------------
>>NavList message boards and member settings: www.fer3.com/NavList
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>>
>>
>>
>>
>>: http://fer3.com/arc/m2.aspx?i=119269
>>
>>
>
>
: http://fer3.com/arc/m2.aspx?i=119271
Sent from my HTC
----- Reply message -----
From: "Geoffrey Kolbe" <geoffreykolbe@compuserve.com>
To: <zvidoron@btinternet.com>
Subject: [NavList] Re: Instrument for solving spherical triangles
Date: Thu, Apr 26, 2012 13:37
List member Wolfgang Koeberer gave a very interesting talk on such
instruments to the recent National Maritime Museum conference in
Greenwich (England). The earliest example he showed dated from the
16th century, I believe. They were re-invented regularly over the
succeeding centuries and all had the feature of four intersecting
circles of adjustment, from which the spherical triangle could be
solved. The astro-compass was probably the latest (and last)
instrument to be commercially made in that tradition and Wolfgang
said that with care, an accuracy of one degree was possible using the
astro-compass.
Geoffrey
At 13:19 26/04/2012, you wrote:
>For this one we have a patent with good pictures in our list archive:
>http://fer3.com/arc/img/106506.fix_finder.pdf
>Unlike the bubble octant, these things are very rare on e-bay,
>from which I conclude that not so many were produced.
>
>Alex.
>
>P.S. My son who had a pilot training in 1994, and who works in
>the airspace industry says that he has never seen a sextant
>(and it was never mentioned during his training) until I showed him one.
>
>On Thu, 26 Apr 2012, G Becker wrote:
>
>>
>>Here is a link to a newspaper blurb on the Zerbee Celestial Fix
>>Finder... the caption says it was revolutionary in jet navigation. :/
>>
>>http://news.google.com/newspapers?nid=2206&dat=19511028&id=FJMzAAAAIBAJ&sjid=YOkFAAAAIBAJ&pg=3196,6472009
>>----------------------------------------------------------------
>>NavList message boards and member settings: www.fer3.com/NavList
>>Members may optionally receive posts by email.
>>To cancel email delivery, send a message to NoMail[at]fer3.com
>>----------------------------------------------------------------
>>
>>
>>
>>
>>: http://fer3.com/arc/m2.aspx?i=119269
>>
>>
>
>
: http://fer3.com/arc/m2.aspx?i=119271