[copperwater69]

There was a neat liquid computer called the MONIAC used to model the national economic processes of the UK.

Here's a video: https://www.youtube.com/watch?v=rAZavOcEnLg

Edit: Oh it was mentioned in the paper!

[tweetle_beetle]

Thank you! I'd heard about it on a radio programme many years ago and had always wondered what it looked like, but somehow never enough to do something about it.