The galton quincunx at the University of Wisconsin pivoted like one of
the old free standing full length mirrors so all the ballbearings could be
brought to the top by inverting the galton quincunx and then they would be
stored in the well (as shown before) Then all the ballbearings would be
released one right after another creating the bell curve.
 
Bruce Rieber
[log in to unmask]