Mechanical Computers

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links and notes:

1.  https://maritime.org/doc/op1140/index.htm
2. https://www.youtube.com/watch?v=gwf5mAlI7Ug
3. https://www.youtube.com/watch?v=5GZa63x3k60
4. https://www.youtube.com/watch?v=NAsM30MAHLg   fourier analyzer machine