There are also pneumatic computers. Here is the recent article: https://cacm.acm.org/news/275366-pneumatic-computing-gains-air-of-importance/fulltext https://ca

There are also pneumatic computers. Here is the recent article: https://cacm.acm.org/news/275366-pneumatic-computing-gains-air-of-importance/fulltext https://cacm.acm.org/news/275366-pneumatic-computing-gains-a..., but I remember (around 30 years ago) mentions of them in the field of nuclear reactors…