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CHARLES BABBAGE INSTITUTE


Center for the History of Information Technology

The calculating engines of English mathematician Charles Babbage (17911871) are among the most celebrated icons in the prehistory of computing. Babbage’s Difference Engine No.1 was the first successful automatic calculator and remains one of the finest examples of precision engineering of the time. Babbage is sometimes referred to as "father of computing." The International Charles Babbage Society (later the Charles Babbage Institute) took his name to honor his intellectual contributions and their relation to modern computers.
Charles Babbage was born on December 26, 1791, the son of Benjamin Babbage, a London banker. As a youth Babbage was his own instructor in algebra, of which he was passionately fond, and was well read in the continental mathematics of his day. Upon entering Trinity College, Cambridge, in 1811, he found himself far in advance of his tutors in mathematics. Babbage cofounded the Analytical Society for promoting continental mathematics and reforming the mathematics of Newton then taught at the university.
In his twenties Babbage worked as a mathematician, principally in the calculus of functions. He was elected a Fellow of the Royal Society in 1816 and played a prominent part in the foundation of the Astronomical Society (later Royal Astronomical Society) in 1820. It was about this time that Babbage first acquired the interest in calculating machinery that became his consuming passion for the remainder of his life.
In 1821 Babbage invented the Difference Engine to compile mathematical tables. On completing it in 1832, he conceived the idea of a better machine that could perform not just one mathematical task but any kind of calculation. This was the Analytical Engine (1856), which was intended as a general symbol manipulator, and had some of the characteristics of today’s computers.
Unfortunately, little remains of Babbage's prototype computing machines. Critical tolerances required by his machines exceeded the level of technology available at the time. And, though Babbage’s work was formally recognized by respected scientific institutions, the British government suspended funding for his Difference Engine in 1832, and after an agonizing waiting period, ended the project in 1842. There remain only fragments of Babbage's prototype Difference Engine, and though he devoted most of his time and large fortune towards construction of his Analytical Engine after 1856, he never succeeded in completing any of his several designs for it. George Scheutz, a Swedish printer, successfully constructed a machine based on the designs for Babbage's Difference Engine in 1854. This machine printed mathematical, astronomical and actuarial tables with unprecedented accuracy, and was used by the British and American governments. Though Babbage's work was continued by his son, Henry Prevost Babbage, after his death in 1871, the Analytical Engine was never successfully completed, and ran only a few "programs" with embarrassingly obvious errors.
Babbage occupied the Lucasian chair of mathematics at Cambridge from 1828 to 1839. He played an important role in the establishment of the Association for the Advancement of Science and the Statistical Society (later Royal Statistical Society). He also attempted to reform the scientific organizations of the period while calling upon government and society to give more money and prestige to scientific endeavor. Throughout his life Babbage worked in many intellectual fields typical of his day, and made contributions that would have assured his fame irrespective of the Difference and Analytical Engines.
Despite his many achievements, the failure to construct his calculating machines, and in particular the failure of the government to support his work, left Babbage in his declining years a disappointed and embittered man. He died at his home in London on October 18, 1871.
In 1985, the Science Museum in London began construction of the Difference Engine No. 2 using Babbage's original designs. The calculating device was completed and working by 1991, just in time for the bicentennial of Babbage's birth. The device consists of 4000 parts and weighs over three metric tons. http://www.sciencemuseum.org.uk/online_science/explore_our_collections /objects/index/smxg62748
The printer for the Difference Engine No. 2 was completed nine years later, in 2000. It has 4000 parts and weighs 2.5 metric tons. http://news.bbc.co.uk/1/hi/sci/tech/710950.stm
Manuscript materials and exhibits:
Publications about Charles Babbage:
Publications on Babbage and Ada Lovelace:
Portrait of Charles Babbage Oil Painting, 1971.
Painting by Virginia Kolence.
© Charles Babbage Institute
Charles Babbage Postage stamp, 1991
In 1991 the Royal Mail Mint issued a commemorative Charles Babbage postal stamp as part of the Scientific Achievements series.
© 1991, Royal Mail Stamps
Portrait of Charles Babbage Lithograph, n.d.
Charles Babbage (17911871)
Difference Engine No.1, Woodcut, 1853
This woodcut depicts a trial piece of the Difference Engine No. 1, built in 1833 and held by the Science Museum, London.
The original caption reads: "Impression from a woodcut of a small portion of Mr. Babbage’s Difference Engine No.1, the property of the Government, at present deposited in the Museum at South Kensington. It was commenced 1823. This portion put together 1833. The construction abandoned 1842. This plate was printed June 1853. This portion was in the Exhibition 1862."
Reprinted Henry Prevost Babbage, Babbage's Calculating Engines: A Collection of Papers. (Los Angeles:Tomash, 1982) CBI Reprint Series, vol. 2
Portion of the calculating mechanism of Difference Engine No.2, constructed by the Science Museum, London. Photograph, 1991
Between 1847 and 1849 Babbage designed, but did not build, the Difference Engine No.2. The Science Museum, London, constructed the calculating machine in 1991, using Babbage’s original designs.
This image depicts a trial piece made by the Science Museum to verify the design of the basic adding element for the full scale engine. The full scale engine has 4000 parts and weighs over three metric tons.
Photograph courtesy of the Science Museum of London.
Augusta Ada Lovelace (18151852) is today hailed as the "first programmer" since she was writing programs for a machine that Babbage had not yet built. She also foresaw the capability of computers to go beyond mere calculating or numbercrunching, indeed to excel at manipulating symbols according to rules.[2]