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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Lunar distance accuracy
From: Wolfgang K�berer
Date: 2007 Oct 25, 11:43 +0200
From: Wolfgang K�berer
Date: 2007 Oct 25, 11:43 +0200
An addendum: White himself uses the term "pillar sextant". But that doesn't necessarily mean a sextant mounted on a pillar: He said it was a Troughton sextant of the beginning of (his) century (i.e. the 19th). As Troughton is said to have invented the "pillar sextant" (double frame sextant) in 1788 it is possible that White was writing about such an instrument. And there is a "pillar sextant" on a pillar in another local museum, the Science museum in London, UK. Have a look at their web site: http://www.sciencemuseum.org.uk/objects/astronomy/1931-95.aspx Wolfgang Dr. Wolfgang K�berer Wolfsgangstr. 92 D-60322 Frankfurt am Main Tel: + 49 69 95520851 Fax: + 49 69 558400 e-mail: koeberer@navigationsgeschichte.de -----Urspr�ngliche Nachricht----- Von: NavList@fer3.com [mailto:NavList@fer3.com] Im Auftrag von Wolfgang K�berer Gesendet: Donnerstag, 25. Oktober 2007 10:23 An: NavList@fer3.com Betreff: [NavList 3569] AW: [NavList 3563] Re: Lunar distance accuracy Two local museums (The Whipple museum for the History of science in Oxford, UK, and the National Maritime Museum in Greenwich,UK) list sextants mounted on pillars among the objects they possess. They are not "pillar sextants" of the double frame type, but clearly not for use on board. So it seems they are a special type intended for surveying on land. Wolfgang Dr. Wolfgang K�berer Wolfsgangstr. 92 D-60322 Frankfurt am Main Tel: + 49 69 95520851 Fax: + 49 69 558400 e-mail: koeberer@navigationsgeschichte.de --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---