Binary marble adding machine

[Thomas Puettmann]

This marble adding machine was designed and built by Matthias Wandel some years ago. Already in the 1960s, John Thomas Godfrey invented two ingenious toys with ball flip-flops. Just search for Digicomp II and Dr Nim. The first person who had the idea to use rolling balls for a binary computer was no other than the inventor of the binary system himself, Gottfried Wilhelm Leibniz, see http://history-computer.com/Dreamers/Leibniz.html.