Galton Board

The Galton board is an upright board with evenly spaced nails driven into its upper half. The nails are arranged in staggered order. The lower half of the board is divided with vertical slats into a number of narrow rectangular slots. From the front, the whole installation is covered with a glass cover. In the middle of the upper edge, there is a funnel in which balls can be poured, the diameter of the balls being much smaller than the distance between the nails. The funnel is located precisely above the central nail of the second row, i. e. the ball, if perfectly centered, would fall vertically and directly onto the uppermost point of this nail’s surface (Fig. 1).