Five Hundred and Seven Mechanical Movements
In a similar vein, here is a video from the US Navy in the 1950s which describes how mechanical computers work (for calculating trajectories of missiles being shot from ships.)Utterly fascinating to see how very simple mechanical devices, like differing gear ratios, can be used to calculate things like logarithms.http://www.youtube.com/watch?v=mpkTHyfr0pM