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The whole training film on mechanical computers, for navy mechanics I believe: https://www.youtube.com/watch?v=s1i-dnAH9Y4

It illustrates the problems and solutions near perfectly, and I've watched it way too many times.

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Thanks, being a long-time lurker, I've just signed up now to say that's great. What a video - I've been writing software for the past 31 years, and I love the simplicity among ingenuity of this. If you've not read it already, you might like http://www.mayofamily.com/RLM/txt_Clarke_Superiority.html

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