Marbleadder: a marble operated adding machine with true logic gates

Completely built out of copper, this machine can add 2 numbers of 4 bits (between 0 and 15) and visualizes how to combine simple logic gates to execute complex operations. More infos here: https://blog.syn2cat.lu/2012/01/21/marble-adder/ See my channel for previous marbleadder videos and other topics