https://www.oldcomputermuseum.com/electronic_computer.html
I had one as a kid and regret a) that I didn't figure it out more, and b) threw it away at some point.
Here are some links to these I have collected:
https://hackaday.io/project/177346-simple-analog-computer-el...
https://computarium.lcd.lu/photos/albums/EDMUND_ANALOG_COMPU...
https://t-lcarchive.org/american-basic-science-club-analog-c...
https://www.oldcomputermuseum.com/electronic_computer.html
I had one as a kid and regret a) that I didn't figure it out more, and b) threw it away at some point.