This [binary] calculus could be implemented by a machine (without wheels)... provided with holes in such a way that they can be opened and closed. They are to be open at those places that correspond to a 1 and remain closed at those that correspond to a 0. Through the opened gates small cubes or marble are to fall into tracks, through the others nothing. It [the gate array] is to be shifted from column to column as required...
— 16 March 1679