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    Compassipedia online compass museum
    From: Paul Hirose
    Date: 2018 Apr 23, 14:41 -0700

    An online magnetic compass museum:
    http://compassmuseum.com/index.htm
    
    The 1923 NACA report No. 128, mentioned in the section on aircraft
    compasses, is on the NASA Technical Reports Server:
    
    https://ntrs.nasa.gov/
    
    Search for "aeronautic instruments". You may have look beyond the first
    page of hits to find the chapter on direction instruments.
    

       
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