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    Re: Sextant Terms
    From: Chuck Taylor
    Date: 2007 Oct 22, 07:26 -0700

    The U.S. Coast Guard has historically used sextants for taking horizontal 
    angles in order to precisely place aids to navigation such as buoys. Given 
    that this example has no shades, I suspect that that was how this unit was 
    used.
    
    Chuck Taylor
      48 N
    122 W
    
    Nicol�s de Hilster wrote:
    
    >   
    There are surveyors sextants (C. Plath for instant) that have an 
    additional pentagon prism attached. This prism adds 90 degrees to the 
    observed angle, so measuring 140 degrees should be no problem with that
     
    prism attached.
    
    One has been for sale on E-bay recently: 
    
    http://cgi.ebay.co.uk/US-Coast-Guard-Weems-Plath-Sextant-w-Case_W0QQitemZ300160900331QQihZ020QQcategoryZ37971QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
    
    Nicol�s
    
    
    
    
    
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