On Friday, March 15, 2013 3:28:47 AM UTC-7, inert...@gmail.com wrote:   
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   > The experiment requires a glass ball, "crystal ball" used as a second mass   
   in addition to the experimenter. I used a 6" (150mm) diameter ~ 9 lb (4Kg)   
   ball. I call it the "human rotary   
      
   Correction: The experiment doesn't require a glass ball, but requires a   
   suitable mass.  The mass I had available to me happened to be made of glass.   
   It's density and transparency come in handy however.   
      
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