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    Re: Lunar distance accuracy
    From: Michael Daly
    Date: 2007 Oct 25, 14:02 -0400

    Wolfgang K�berer wrote:
    >
    > 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
    
    
    Ah yes - a double frame (pillar) sextant on a stand (pillar) - that 
    ought to clear things up!  :-)
    
    I have a scientific antique dealer's catalogue here with a surveyor's 
    sextant described as a pillar sextant, so the term is clearly ambiguous.
    
    Troughton's patent was issued in 1788.  If this is online or readily 
    accessible to someone in Britain at a patent records office, it would be 
    interesting to find out what name he used for it.
    
    I always took the "official" name to be double-frame and pillar to be 
    the colloquial, but can't find anything in my books to support that notion.
    
    
    Mike
    
    
    
    
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