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    Re: Arg 1 Ww 11 U Boat Navigation Device Ebay Item Number: 370193239339
    From: Dave Walden
    Date: 2009 May 28, 05:11 -0700

    Spreadsheet with plots this time.
    
    
    >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
    The use, as explained by gl and his attachments, is simple.  Set the index 
    mark on the clear overlay to 90 degrees North.  Put a mark on the overlay at 
    the body's LHA and Dec.  Rotate the index mark to the observer's Lat, read 
    Alt and Zn.  That's it!
    
    Creating the plot involved an interesting side trip to Wolff nets, 
    crystallography, "East Poles" and projections.  Google image "Wolff net" for 
    some already made up.  Google web "Wolff net"  for Wolff and diffraction 
    origins.  Wikipedia has equations; check "stereographic projection".  A 
    helpful web site was:
    
    http://journals.iucr.org/iucr-top/comm/cteach/pamphlets/11/node4.html
    
    A spreadsheet for playing with the projection, and a FORTRAN program to 
    generate the diagram are attached.
    
    
    
    
    Attached File: 108425.stereographic.xls (no thumbnail available)
    Attached File: 108425.arg2.f (no thumbnail available)
    
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    File: 108426.stereographic2.xls
       
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