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Figure 1-1 The Pascaline, photograph by Yves Serra (http://pagesperso-orange.fr/yves.serra/). In the early 1800s inventors were just beginning to build the power-driven machinery that would fuel the industrial revolution. One of these inventors, Joseph Marie Jacquard, invented a loom in 1801 that revolutionized the weaving industry. Although it was not the first mechanical loom, Jacquard s loom was revolutionary in that it could be used to weave complex and intricate patterns automatically. The key idea behind the loom was that the pattern to be woven into the cloth was encoded by holes punched in a card. A group of these cards, that were literally strung together, provided the information required to
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Figure 1-2 The Jacquard Loom, photograph by Frank da Cruz (http://www.columbia.edu/acis/history/jacquard.html).
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control the actions of the loom. The Jacquard loom required fewer people and little skill to operate, and versions of the loom are still in use today. The Jacquard loom also had a profound impact on computing in that it was the one of the first devices that could be programmed. The loom gave birth to the concept of punched cards, which played a fundamental role in the early days of computing. Charles Babbage, a mathematician and inventor, grew tired of calculating astronomical tables by hand, and conceived of a way to build a mechanical device to perform the calculations automatically. In 1822 Babbage started work on a computing device, the difference engine, to automatically calculate mathematical tables. During the course of his work on the difference engine, he conceived of a more sophisticated machine he called the analytical engine. The analytical engine was meant to be programmed using punched cards, and would employ features such as sequential control, branching, and looping. Although Babbage never built a complete working model of either machine, his work became the basis on which many modern computers are built. (One of Babbage s earlier difference engines was eventually constructed from drawings by a team at London s Science Museum in the 1990s. The machine weighs 3 tons and is 10 feet wide by 6 1/2 feet tall.)
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Figure 1-3 Jacquard Loom Cards, photograph by Doug Jones (http://www.cs.uiowa.edu/~jones/cards/history.html).
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In his work on the analytical engine, Babbage made an important intellectual leap regarding the punched cards. In the Jacquard loom, the presence or absence of each hole in the card physically allows a colored thread to pass or stops that thread. Babbage realized that the pattern of holes could be used to represent an abstract idea such as a problem statement or the raw data required for that problem s solution. Because of the connection to the Jacquard loom, Babbage called the two main parts of his Analytic Engine the Store and the Mill , as both terms are used in the weaving industry. The Store was where numbers were held, and the Mill was where they were woven into new results. In a modern computer these same parts are called the memory unit and the central processing unit (CPU). Perhaps the key concept that separated the analytical engine from its predecessors was that it supported conditional program execution. This allows the machine to determine what to do next, based upon a condition or situation that is detected at the very moment the program is running.
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Augusta Ada Byron, the countess of Lovelace, was a mathematician who worked with Charles Babbage on his analytical engine. Unlike Babbage, who was interested in building a computing device, Lovelace sought to understand and reason about methods for computing. She studied these methods, their implementations, and the properties of their implementations. Lovelace even developed a program that would have been able to compute the Bernoulli numbers. (Bernoulli numbers comprise a sequence of rational numbers that have many roles in mathematics and number theory.) In her published analysis of the analytical engine, Lovelace outlined the fundamentals of computer programming, including looping and memory addressing. The influence of the Jacquard loom on her work was evident in her writing, We may say most aptly that the analytical engine weaves algebraic patterns just as the Jacquard loom weaves flowers and leaves. It is because of this work that many consider Lovelace to be the world s first programmer. The US Department of Defense named the computer language ADA in honor of Lovelace s work as a programmer.
Figure 1-4 Ada Lovelace (http://www-groups.dcs.st-and.ac.uk/~history/PictDisplay/Lovelace.html).
The 1890 census of the United States proved another milestone in the history of computing when punch cards were used with automatic sorting and tabulating equipment invented by Herman Hollerith to speed the compilation of the data. His machines reduced the time required for a full compilation of census results from 10 years to 3 months, and saved $5,000,000 in costs to the census bureau. Building on the success of his equipment with the US Census Bureau, Hollerith founded the Tabulating Machine Company in 1896. After merging with two other companies and changing its name, the company became known as the International Business Machines (IBM) Corp. The punch card remained a staple of data storage well into the 20th century.
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