- this post will be edited later *
links and notes:
- https://maritime.org/doc/op1140/index.htm
- https://www.youtube.com/watch?v=gwf5mAlI7Ug
- https://www.youtube.com/watch?v=5GZa63x3k60
- https://www.youtube.com/watch?v=NAsM30MAHLg fourier analyzer machine
links and notes: