I gotta post something, so I'll post the mechanical calculator that the flight school wanted me to get. How it works is that you can set ratios in the dial and multiply them. In this picture, it's 60:10 (or 60:1.0) so I can take any number from the inner circle in minutes and find out how many hours that is equal to on the outer circle.
There are also other things on this calculator, including a wind vector calculator, and charts. Most pilots don't use these anymore, but they still wanted me to know how to use one
I'm sorry, I'm either not that person or don't get the reference
Chris Staecker is a math professor with a couple of YouTube channels- one of which is dedicated to exploring analog adding machines.
I misremembered his video about the E6B flight computer (yt tracker removed)