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Charles Babbage’s Analytical engine

Charles Babbage’s Analytical engine. By Nicholas Lucaroni. Difference Engine. Uses the differences method to tabulate polynomials. Construction wasn’t completed: Internal Friction and Gearing were not accurate enough. Kept changing his mind on the design. Analytical Engine.

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Charles Babbage’s Analytical engine

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  1. Charles Babbage’sAnalytical engine By Nicholas Lucaroni

  2. Difference Engine • Uses the differences method to tabulate polynomials. • Construction wasn’t completed: • Internal Friction and Gearing were not accurate enough. • Kept changing his mind on the design.

  3. Analytical Engine • First attempt at a digital computer, at 1834. • Programmable, could solve more then just polynomials. • Had a store and a mill which would represent memory and processor today. • Input and output was controlled through punch cards. • Ran off a steam engine.

  4. The Mill and Store • The store could hold 1000 50 digit numbers. • The Mill could perform any basic operation (addition, subtraction…). • and used “normal” base 10 arithmetic.

  5. Input / Output • Input and output was on punch cards, similar to the ones used in looms at that time. • Output also had a printer, curve plotter, and a bell. • A separate

  6. Three Types of Punch Cards • Operation Cards • Perform Arithmetic operations • Combinatorial cards • Advance/back cards (perform loops and jumps) • Number Cards • Numerical constants, usually punched by the machine for later use. • Variable Cards • Direct transfer of values to serve as arguments for operations.

  7. The end results… • Never built due to technology limitations with the precision of gears, cogs and wheels. • Also limited by funding, due to the scrap of his difference engine project before.

  8. Other resources • Original texts can be found at: • http://www.fourmilab.ch/babbage/contents.html • Emulator of analytical engine in Java: • http://www.fourmilab.ch/babbage/websim/ae.html

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