Short clip, taken at Computer History Museum, CA demonstrating the actual, working version of Difference Engine. It was built by London Science Museum, based on the drawings left by Babbage. Original version is in London and this is Difference Engine-2.
Most amazing thing is it works accurately and gives out correct answer, with 4 rotations. And everything is mechanical! So, gears shift in such a way, to inform carry propagation as well. Very fascinating!
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