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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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difference engine
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
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.
the mill and store
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.
input output
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
three types of punch cards
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.
the end results
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.
other resources
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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