O.K. That would be about 4-5" diameter for the larger of the
two balls, I guess.
That *might* be enough to see the gravitational deflection of the
smaller as the larger approaches -- with magnification examining the
point at the bottom of the suspended smaller ball. And this would
require some rather low-friction suspension -- perhaps a piece of thin
music wire a few feet long attached to the upper end of the rod.
But I'm not at all sure that this is the *intended* function of
these balls. I would love to know what they turn out to be.
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