Chapter 28: Models of Evolution: Figure 28.23 - (A) Galton's “pinball” machine, also called Galton’s quincunx, was devised to illustrate the convergence to a normal distribution.

Figure 28.23 - (A) Galton’s “pinball” machine, also called Galton’s quincunx, was devised to illustrate the convergence to a normal distribution. Figure 28.23 - (B) Rendering of Galton’s quincunx based on an illustration in his book <i>Natural Inheritance</i>.

Figure 28.23. (A) Galton’s “pinball” machine, also called Galton’s quincunx, was devised to illustrate the convergence to a normal distribution. Written on the face of the device by Galton is “Instrument to illustrate the Law of Error on Dispersion by Francis Galton FRS.” (B) Rendering of Galton’s quincunx based on an illustration in his book Natural Inheritance. (A, Courtesy of the Galton Collection, University College London. Photo GALT063. http://www.ucl.ac.uk/silva/museums/galton/collections/highlights/statistics/GALT063. B, Modified from Fig. 7, p. 63 in Galton F. 1889. Natural Inheritance, MacMillan, New York and London.)

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