Topic: The analytical engine (Circa 1830's)

[Stormbringer]

Charles Babbage's first attempt at a mechanical computing device was the difference engine, a special-purpose computer designed to tabulate logarithms and trigonometric functions by evaluating approximate polynomials. As this project faltered for personal and political reasons, he realized that a much more general design was possible, he started work designing the analytical engine.

The analytical engine was to be powered by a steam engine and would have been over 30 meters long and 10 meters wide. The input (programs and data) was to be provided to the machine on punch cards, a method being used at the time to direct mechanical looms. For output, the machine would have a printer, a curve plotter and a bell. The machine would also be able to punch numbers onto cards to be read in later. It employed ordinary base-10 fixed-point arithmetic. There was a store (i.e., a memory) capable of holding 1,000 numbers of 50 digits each. An arithmetical unit (the "mill") would be able to perform all four arithmetical operations.

The programming language to be employed was akin to modern day assembly languages. Loops and conditional branching were possible and so the language as conceived would have been Turing-complete. Three different types of punch cards were used: one for arithmetical operations, one for numerical constants, and one for load and store operations, transferring numbers from the store to the arithmetical unit or back. There were three separate readers for the three types of cards.

In 1842, the Italian mathematician Luigi Menabrea, whom Babbage had met while travelling in Italy, wrote a description of the engine in French. In 1843, the description was translated into English and extensively annotated by Ada King, Countess of Lovelace, who had become interested in the engine ten years earlier. In recognition of her additions to Menabrea's paper, she has been described as the first computer programmer. The modern computer programming language Ada is named in her honor.

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Partial construction
In 1878, a committee of the British Association for the Advancement of Science recommended against constructing the analytical engine, which sank Babbage's efforts for government funding.

In 1910, Babbage's son Henry P. Babbage reported that a part of the mill and the printing apparatus had been constructed and had been used to calculate a (faulty) list of multiples of pi. This constituted only a small part of the whole engine; it was not programmable and had no storage.

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Influence
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Computer science
The analytical engine was then all but forgotten with three known exceptions. Percy Ludgate wrote about the engine in 1915 and even designed his own analytical engine (it was drawn up in detail but never built). Ludgate's engine would be much smaller than Babbage's of about 8 cubic feet (230 L) and hypothetically would be capable of multiplying two 20-decimal-digit numbers in about 6 seconds. Leonardo Torres y Quevedo and Vannevar Bush also knew of Babbage's work, though the three inventors likely did not know of each other.

Closely related to Babbage's work on the analytical engine was the work of George Stibitz of Bell Laboratories in New York just prior to WWII and Howard Hathaway Aiken at Harvard, during and just after WWII. They both built electromechanical (i.e. relay-and-switch) computers which were closely related to the analytical engine, though neither was (quite) a modern programmable computer. Aiken's machine was largely financed by IBM and was called the Harvard Mark I.

From Babbage's autobiography:

As soon as an Analytical Engine exists, it will necessarily guide the future course of the science.
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Fiction
The cyberpunk novelists William Gibson and Bruce Sterling co-authored a steampunk novel of alternative history entitled The Difference Engine in which Babbage's difference and analytical engines became available to Victorian society. The novel explores the consequences and implications of the early introduction of computational technology.

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External links
The Analytical Engine at Fourmilab
L. F. Menabrea, Ada Augusta, Sketch of the Analytical Engine, Bibliothèque Universelle de Genève, Number 82, October 1842.
Randell, Brian, From Analytical Engine to Electronic Digital Computer: The Contributions of Ludgate, Torres, and Bush, Annals of the History of Computing, Volume 4, Number 4, October 1982.
Special issue, IEEE Annals of the History of Computing, Volume 22, Number 4, October–December 2000.
Retrieved from "http://en.wikipedia.org/wiki/Analytical_engine"