History Memes

Unfortunately, it doesn't look like a digital version of that book has ever been released. (Other than reference text, I almost exclusively read ebooks). I did grab the documentary, sounds interesting.

Any chance you can recommend a book that covers German cryptography and the OSS effort within Germany to spy on it before and during the war?

From what I understand from diagrams and descriptions, it was a surprisingly simple device. Especially before the plugboard. I haven't tried to run the numbers or played with it, but I would think just an 8bit microcontroller could break enigma encoding in seconds or less.

When it comes to mechanical math devices, should I ever get to retire or be rich: I want to reproduce a Curta Calculator. Super neat devices.

Another similar device that I've used is the dividing or indexing head. They are used to precisely locate angled machining operations such as hobbing gears, cutting bolt heads, accurate bolt hole circles, etc.