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    Re: Stereographic Devices
    From: George Huxtable
    Date: 2010 Apr 14, 23:06 +0100

    Yes. The oldest instrument of all; the astrolabe uses a stereographic
    projection.
    
    George.
    
    contact George Huxtable, at  george{at}hux.me.uk
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    ----- Original Message -----
    From: "Robin Stuart" 
    To: 
    Sent: Wednesday, April 14, 2010 2:29 PM
    Subject: [NavList] Stereographic Devices
    
    
    Bowditch (2002 Edition) page 31 states: The principal navigational use of
    the stereographic projection is for charts of the polar regions and devices
    for mechanical or graphical solution of the navigational triangle.
    END QUOTE
    
    The devices mentioned would presumably exploit the property of sterographic
    projection that circles on the sphere remain circles on a planar chart.
    Does anyone know of examples of such devices?
    
    Robin Stuart
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