Smithsonian Institution Letters between the Smithsonian Institution, L S Penrose, E S Pearson and others regarding an invention by Francis Galton to illustrate the principle of the law of error or dispersion. His device consisted of a box with a base divided into segments by pins, into which small metal balls could be dropped through a funnel. The box was located in the basement of UCL's statistics department. It was variously known as the "Quincunx", "Galton Box", "shot-machine" and "bean machine". The correspondence concerns a request for photographs by the Smithsonian so that they might create a replica for an exhibition. A photograph of an original drawing of the box, a purchase order and invoice are enclosed. May-Sep 1961