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    Re: Lunar distance accuracy
    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{at}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{at}navigationsgeschichte.de
    
    
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