Babbage's Difference Engine No. 2, Part 2: The Calculation Section
In the 1840's, the English mathematician Charles Babbage designed his "Difference Engine No. 2", a special-purpose mechanical computer for constructing mathematical tables using the method of finite differences. The machine is massive, weighing several tons, and was not actually built until 1991. This multi-part video series explains what the Difference Engine No. 2 does and how it works.
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Babbage's Difference Engine No. 2, Part 3: Interlocks
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Babbage's Difference Engine No. 2, Part 1: The method of finite differences
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The 90-Degree Torque Problem
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Babbage's Difference Engine No. 2, Part 4: The Control Section
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A demo of Charles Babbage's Difference Engine
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