You will love the mechanical analog ballistic computers of 50's: http://www.boingboing.net/2010/05/19/how-a-1950s-ballisti.html http://www.boingboing.net/2010/0

You will love the mechanical analog ballistic computers of 50's: http://www.boingboing.net/2010/05/19/how-a-1950s-ballisti.html http://www.boingboing.net/2010/05/19/how-a-1950s-ballisti.ht... It explains all the mechanics used for adders, integrators, differentiators, etc... very insightful.