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The counting balls are those lines of five ball bearings suspended from
two rails. Pull n balls off one side (n<5) and realease them, n balls
are ejected from the other side after the first n balls collide.
I think this is also called the "Newtonian Demonstrator" or the
"swinging balls" demonstration.
Regards,
Steven Ratliff
Steven T. Ratliff
Associate Professor of Physics
Northwestern College
3003 Snelling Av. N.
Saint Paul, MN 55113-1598
Internet: stratliff@nwc.edu (or str@nwc.edu)