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    The Visual Bygrave
    From: Brad Morris
    Date: 2009 Jun 14, 23:40 -0700

    Attached, please find an interesting bit of confection I call the Visual Bygrave.
    
    For those who don't own a Bygrave or MHR-1, for those too lazy to print out 
    Gary's Flat Bygrave, I present this slide rule, written in Excel and (just a 
    little) Visual Basic.
    
    It has all the feel of using the MHR-1.  The steps are just like you would 
    perform, in the same order, as using either of the physical realizations of 
    the Bygrave rule.  
    
    You fill in your known values (Declination, Meridian Angle (t) and Latitude) 
    in the white space in the yellow square.  Then you manipulate the pointers 
    which for us are Red Dots and the upper scale, which is the 
    Log(Abs(Cotangent(Radians(angle)))).  The Zig-Zag solution printed on the 
    MHR-1 is followed.  Each manipulation of the Visual Bygrave slide rule brings 
    you closer to the solution of Azimuth and Altitude.
    
    Note that you just click the steps and move the slider bars.  No need to copy, 
    cut and paste values.  All entries are automatically filled in as you go.  
    You must be careful to follow the steps in the order required, which is click 
    the radio button and then move the appropriate slider bar to the correct 
    value.
    
    Instructions and FAQs are included.
    
    Best Regards
    Brad
    
    
    File:
    Visual-Bygrave_v3.xls
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