> You can build a mechanical, digital computer from many systems like pneumatics for example. This is mentioned in the video (kinda), in that the video talks a

> You can build a mechanical, digital computer from many systems like pneumatics for example. This is mentioned in the video (kinda), in that the video talks about Stibitz’ Model K, an electromechanical digital adder using relays, followed by various systems culminating in the programmable general-purpose Model V. As the video then explains, ignoring nuisance (noise and vibrations) the problems of mechanical computers are signal propagation, and wear / reliability, they’re awful even compared to vacuum tubes.