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.)<p>Utterly fascinating to see how very simple mechanical devices, like differing gear ratios, can be used to calculate things like logarithms.<p><a href="http://www.youtube.com/watch?v=mpkTHyfr0pM" rel="nofollow">http://www.youtube.com/watch?v=mpkTHyfr0pM</a>