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    Re: New compact backup CELNAV system
    From: Brad Morris
    Date: 2009 Feb 26, 03:12 -0800

    Hi Gary
    
    Just to be clear, I was not questioning the accuracy of the Flat Bygrave, WHEN 
    FLAT.  Just as you have indicated, when flat, the device yields perfectly 
    acceptable results.  Since the scales are a realization of the equations, 
    unquestionably, they should work when used as directed.
    
    If, however, one scale was distorted by an out-of-flat condition, then we 
    would see errors proportional to the error in flatness. One scale flat, with 
    the other distorted will yield problems. That was my assertion and remains 
    so.  Sharp as you are, you should see that as well.  
    
    My comments also indicated wrapping the scales around cylinders, which 
    eliminates the distortion of one scale to another.  That solves the 
    out-of-flat condition by making the surfaces stiff.  The follow-on problem, 
    how to lock one cylinder to another securely, forces a mechanical solution.  
    Bygrave himself didn't solve that properly.  There are a few mechanical 
    arrangements I can think of to do that, all involving multiple moving parts.  
    This would force your simple Flat Bygrave solution to a more complicated 
    cylindrical Bygrave solution, and keep the device out of the hands of many 
    who would try.
    
    Again: Nothing wrong with the Flat Bygrave when used properly.  You should be 
    rightly proud of it.  Gosh knows I would be!
    
    Best Regards
    Brad  
    
    
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