This Demonstration shows the path of a point mass falling through a Galton board under the influence of gravity and air friction. The nails that deflect the point mass are modeled to have a finite radius and a soft, rubberlike surface material. The detailed path of the point mass depends sensitively on the initial conditions.
 Contributed by: Michael Trott with permission of Springer
 From: The Mathematica GuideBook for Numerics, second edition by Michael Trott (© Springer, 2008).
For theoretical results on flows through Galton boards, see: L. Bruno, A. Calvo, I. Ippolito, "Dispersive Flow of Disks through a TwoDimensional Galton Board," Eur. Phys. J. E, 11(2), 2003 pp. 131140. N. Chernov, D. Dolgopyat, "Diffusive Motion and Recurrence on an Idealized Galton Board," Phys. Rev. Lett., 99(3), 030601, 2007. For the influence of the operators on the paths, see: R. G. Jahn, B. J. Dunne, "On the Quantum Mechanics of Consciousness, with Application to Anomalous Phenomena," Found. Phys., 16(8), 1986 pp. 721772. B. J. Dunne, R. D. Nelson, and R. G. Jahn, "OperatorRelated Anomalies in a Random Mechanical Cascade," J. Sc. Explor., 2(2), 1988 pp. 155179.
From: The Mathematica GuideBook for Numerics, second edition by Michael Trott (© Springer, 2008).
