On Friday, March 15, 2013 3:28:47 AM UTC-7, inert...@gmail.com wrote:

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.