This is a mechanical computer that can do Fourier analysis on signals using gears. This math is the basis for all modern telecommunications and is nowadays done electronically. It's amazing to see it done mechanically. The guy who designed it is the same guy who measured the speed of light in the famous Michelson-Morley experiment. Parts 3 to 4: http://www.youtube.com/watch?v=8KmVDxkia_w http://www.youtube.com/watch?v=6dW6VYXp9HM http://www.youtube.com/watch?v=jfH-NbsmvD4