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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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