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    Bygrave and Aquino
    From: Gary LaPook
    Date: 2009 Sep 06, 08:21 -0700

    We have discussed in the past whether Bygrave used "Aquino's" method of
    sight reduction in the creation of his slide rule and whether this would
    shed some light on whether the scales on the Bygrave should be called
    "tangent- secant" or "cotangent- cosine."
    
    See:
    http://www.fer3.com/arc/m2.aspx?i=109184&y=200907
    
    and
    
    
    
    
    http://groups.google.com/group/navlist/browse_thread/thread/899a89a531323f7b/c8e72e846a8e8016?hl=en&lnk=gst&q=aquino#c8e72e846a8e8016
    
    
    
    
    Page 134 of "Primer of Celestial Navigation" by John Favill published in
    1944 and available here:
    
    
    
    
    
    http://books.google.com/books?id=0APvK5PsMlsC&pg=PA134&lpg=PA134&dq=Aquino%27s+method&source=bl&ots=z77XreGi_j&sig=Haj8sY-06llnTMwylnet3bLw-60&hl=en&ei=ro4gSuycEqTmtgPru7iQBA&sa=X&oi=book_result&ct=result&resnum=4#v=onepage&q=Aquino%27s%20method&f=false
    
    
    states that in 1934 the U.S. Navy Hydrographic Office published a
    comparison of 29 methods of sight reduction. Favill then goes on to say
    that he knows of five more methods published after the 1934 compendium
    including "Aquino's 'Tangent Secant Tables'" plus Hughes, Ageton, H.O.
    214 and "Aquino's method of finding latitude and longitude directly."
    
    Aquino apparently published many methods of navigation. The one he
    published in 1909 doesn't resemble the Bygrave solution. If his "Tangent
    and Secant Tables" use the same method as Bygrave then they were
    published well after Bygrave made his slide rule in 1920.
    
    gl
    
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