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    Re: Trombone Kamal Prototype
    From: Greg Rudzinski
    Date: 2009 Jun 5, 08:13 -0700

    Frank,
    
         Thanks for your analysis. I will compare horizontal sextant
    angles with the Trombone Kamal for a baseline check.
    
    Greg
    
    On Jun 4, 9:30�pm,  wrote:
    > Greg, of your observations, you wrote:
    > "Avg. � 4.1'T � Scatter 19.7'"
    >
    > I was going to mention that you may want to calibrate your device with some 
    observations of objects at fixed angular separations since you can't really 
    be sure about the baseline of your triangles to better than about half an 
    inch. That 4.1' average error could probably be reduced a bit.
    >
    > As for scatter (the full range from max negative error to max positive 
    error), it's not really a useful statistical measure. It's better to look at 
    the standard deviation, which I find for your numbers is just about 6'. 
    That's right in line with observational experiments that I've done (and seen 
    done) with cross-staffs, which is what you've got there. So that's looking 
    very reasonable. I doubt you could get much better in terms of statistical 
    spread without some means of looking in two directions simultaneously; for 
    example via the double reflection principle of the sextant.
    >
    > -FER
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